diff --git a/crates/api/src/community.rs b/crates/api/src/community.rs
index 5f4fe3c71..8e499414c 100644
--- a/crates/api/src/community.rs
+++ b/crates/api/src/community.rs
@@ -10,14 +10,11 @@ use lemmy_api_common::{
   is_mod_or_admin,
 };
 use lemmy_apub::{
+  activities::block::SiteOrCommunity,
   objects::{community::ApubCommunity, person::ApubPerson},
   protocol::activities::{
-    community::{
-      add_mod::AddMod,
-      block_user::BlockUserFromCommunity,
-      remove_mod::RemoveMod,
-      undo_block_user::UndoBlockUserFromCommunity,
-    },
+    block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
+    community::{add_mod::AddMod, remove_mod::RemoveMod},
     following::{follow::FollowCommunity as FollowCommunityApub, undo_follow::UndoFollowCommunity},
   },
 };
@@ -213,6 +210,7 @@ impl Perform for BanFromCommunity {
 
     let community_id = data.community_id;
     let banned_person_id = data.person_id;
+    let remove_data = data.remove_data.unwrap_or(false);
     let expires = data.expires.map(naive_from_unix);
 
     // Verify that only mods or admins can ban
@@ -254,10 +252,11 @@ impl Perform for BanFromCommunity {
       .await?
       .ok();
 
-      BlockUserFromCommunity::send(
-        &community,
+      BlockUser::send(
+        &SiteOrCommunity::Community(community),
         &banned_person,
         &local_user_view.person.clone().into(),
+        remove_data,
         expires,
         context,
       )
@@ -268,8 +267,8 @@ impl Perform for BanFromCommunity {
         .await?
         .map_err(LemmyError::from)
         .map_err(|e| e.with_message("community_user_already_banned"))?;
-      UndoBlockUserFromCommunity::send(
-        &community,
+      UndoBlockUser::send(
+        &SiteOrCommunity::Community(community),
         &banned_person,
         &local_user_view.person.clone().into(),
         context,
@@ -278,7 +277,7 @@ impl Perform for BanFromCommunity {
     }
 
     // Remove/Restore their data if that's desired
-    if data.remove_data.unwrap_or(false) {
+    if remove_data {
       // Posts
       blocking(context.pool(), move |conn: &'_ _| {
         Post::update_removed_for_creator(conn, banned_person_id, Some(community_id), true)
diff --git a/crates/api/src/local_user.rs b/crates/api/src/local_user.rs
index bd32280e7..3418bedc7 100644
--- a/crates/api/src/local_user.rs
+++ b/crates/api/src/local_user.rs
@@ -14,6 +14,10 @@ use lemmy_api_common::{
   send_password_reset_email,
   send_verification_email,
 };
+use lemmy_apub::{
+  activities::block::SiteOrCommunity,
+  protocol::activities::block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
+};
 use lemmy_db_schema::{
   diesel_option_overwrite,
   diesel_option_overwrite_to_url,
@@ -443,13 +447,14 @@ impl Perform for BanPerson {
     let expires = data.expires.map(naive_from_unix);
 
     let ban_person = move |conn: &'_ _| Person::ban_person(conn, banned_person_id, ban, expires);
-    blocking(context.pool(), ban_person)
+    let person = blocking(context.pool(), ban_person)
       .await?
       .map_err(LemmyError::from)
       .map_err(|e| e.with_message("couldnt_update_user"))?;
 
     // Remove their data if that's desired
-    if data.remove_data.unwrap_or(false) {
+    let remove_data = data.remove_data.unwrap_or(false);
+    if remove_data {
       // Posts
       blocking(context.pool(), move |conn: &'_ _| {
         Post::update_removed_for_creator(conn, banned_person_id, None, true)
@@ -501,6 +506,31 @@ impl Perform for BanPerson {
     })
     .await??;
 
+    let site = SiteOrCommunity::Site(
+      blocking(context.pool(), Site::read_local_site)
+        .await??
+        .into(),
+    );
+    if ban {
+      BlockUser::send(
+        &site,
+        &person.into(),
+        &local_user_view.person.into(),
+        remove_data,
+        expires,
+        context,
+      )
+      .await?;
+    } else {
+      UndoBlockUser::send(
+        &site,
+        &person.into(),
+        &local_user_view.person.into(),
+        context,
+      )
+      .await?;
+    }
+
     let res = BanPersonResponse {
       person_view,
       banned: data.ban,
diff --git a/crates/api_common/src/lib.rs b/crates/api_common/src/lib.rs
index a49e8e4f3..1ece690a0 100644
--- a/crates/api_common/src/lib.rs
+++ b/crates/api_common/src/lib.rs
@@ -35,7 +35,6 @@ use lemmy_utils::{
   LemmyError,
   Sensitive,
 };
-use url::Url;
 
 pub async fn blocking<F, T>(pool: &DbPool, f: F) -> Result<T, LemmyError>
 where
@@ -311,7 +310,7 @@ pub async fn build_federated_instances(
 
     let mut linked = distinct_communities
       .iter()
-      .map(|actor_id| Ok(Url::parse(actor_id)?.host_str().unwrap_or("").to_string()))
+      .map(|actor_id| Ok(actor_id.host_str().unwrap_or("").to_string()))
       .collect::<Result<Vec<String>, LemmyError>>()?;
 
     if let Some(allowed) = allowed.as_ref() {
diff --git a/crates/api_crud/src/site/create.rs b/crates/api_crud/src/site/create.rs
index 9b4266e2a..3e813e475 100644
--- a/crates/api_crud/src/site/create.rs
+++ b/crates/api_crud/src/site/create.rs
@@ -7,7 +7,7 @@ use lemmy_api_common::{
   site::*,
   site_description_length_check,
 };
-use lemmy_apub::generate_inbox_url;
+use lemmy_apub::generate_site_inbox_url;
 use lemmy_db_schema::{
   diesel_option_overwrite,
   diesel_option_overwrite_to_url,
@@ -75,7 +75,7 @@ impl PerformCrud for CreateSite {
       enable_nsfw: data.enable_nsfw,
       community_creation_admin_only: data.community_creation_admin_only,
       last_refreshed_at: Some(naive_now()),
-      inbox_url: Some(generate_inbox_url(&actor_id)?),
+      inbox_url: Some(generate_site_inbox_url(&actor_id)?),
       private_key: Some(Some(keypair.private_key)),
       public_key: Some(keypair.public_key),
       ..SiteForm::default()
diff --git a/crates/apub/src/activities/community/block_user.rs b/crates/apub/src/activities/block/block_user.rs
similarity index 68%
rename from crates/apub/src/activities/community/block_user.rs
rename to crates/apub/src/activities/block/block_user.rs
index f5a6f02ce..8411ceb03 100644
--- a/crates/apub/src/activities/community/block_user.rs
+++ b/crates/apub/src/activities/block/block_user.rs
@@ -1,7 +1,9 @@
 use crate::{
   activities::{
+    block::{generate_cc, generate_instance_inboxes, SiteOrCommunity},
     community::{announce::GetCommunity, send_activity_in_community},
     generate_activity_id,
+    send_lemmy_activity,
     verify_activity,
     verify_is_public,
     verify_mod_action,
@@ -9,9 +11,10 @@ use crate::{
   },
   activity_lists::AnnouncableActivities,
   objects::{community::ApubCommunity, person::ApubPerson},
-  protocol::activities::community::block_user::BlockUserFromCommunity,
+  protocol::activities::block::block_user::BlockUser,
 };
 use activitystreams_kinds::{activity::BlockType, public};
+use anyhow::anyhow;
 use chrono::NaiveDateTime;
 use lemmy_api_common::blocking;
 use lemmy_apub_lib::{
@@ -31,21 +34,23 @@ use lemmy_db_schema::{
 use lemmy_utils::{utils::convert_datetime, LemmyError};
 use lemmy_websocket::LemmyContext;
 
-impl BlockUserFromCommunity {
-  pub(in crate::activities::community) fn new(
-    community: &ApubCommunity,
-    target: &ApubPerson,
-    actor: &ApubPerson,
+impl BlockUser {
+  pub(in crate::activities::block) async fn new(
+    target: &SiteOrCommunity,
+    user: &ApubPerson,
+    mod_: &ApubPerson,
+    remove_data: Option<bool>,
     expires: Option<NaiveDateTime>,
     context: &LemmyContext,
-  ) -> Result<BlockUserFromCommunity, LemmyError> {
-    Ok(BlockUserFromCommunity {
-      actor: ObjectId::new(actor.actor_id()),
+  ) -> Result<BlockUser, LemmyError> {
+    Ok(BlockUser {
+      actor: ObjectId::new(mod_.actor_id()),
       to: vec![public()],
-      object: ObjectId::new(target.actor_id()),
-      cc: vec![community.actor_id()],
-      target: ObjectId::new(community.actor_id()),
+      object: ObjectId::new(user.actor_id()),
+      cc: generate_cc(target, context.pool()).await?,
+      target: target.id(),
       kind: BlockType::Block,
+      remove_data,
       id: generate_activity_id(
         BlockType::Block,
         &context.settings().get_protocol_and_hostname(),
@@ -57,23 +62,32 @@ impl BlockUserFromCommunity {
 
   #[tracing::instrument(skip_all)]
   pub async fn send(
-    community: &ApubCommunity,
-    target: &ApubPerson,
-    actor: &ApubPerson,
+    target: &SiteOrCommunity,
+    user: &ApubPerson,
+    mod_: &ApubPerson,
+    remove_data: bool,
     expires: Option<NaiveDateTime>,
     context: &LemmyContext,
   ) -> Result<(), LemmyError> {
-    let block = BlockUserFromCommunity::new(community, target, actor, expires, context)?;
+    let block = BlockUser::new(target, user, mod_, Some(remove_data), expires, context).await?;
     let block_id = block.id.clone();
 
-    let activity = AnnouncableActivities::BlockUserFromCommunity(block);
-    let inboxes = vec![target.shared_inbox_or_inbox_url()];
-    send_activity_in_community(activity, &block_id, actor, community, inboxes, context).await
+    match target {
+      SiteOrCommunity::Site(_) => {
+        let inboxes = generate_instance_inboxes(user, context.pool()).await?;
+        send_lemmy_activity(context, &block, &block_id, mod_, inboxes, false).await
+      }
+      SiteOrCommunity::Community(c) => {
+        let activity = AnnouncableActivities::BlockUser(block);
+        let inboxes = vec![user.shared_inbox_or_inbox_url()];
+        send_activity_in_community(activity, &block_id, mod_, c, inboxes, context).await
+      }
+    }
   }
 }
 
 #[async_trait::async_trait(?Send)]
-impl ActivityHandler for BlockUserFromCommunity {
+impl ActivityHandler for BlockUser {
   type DataType = LemmyContext;
 
   #[tracing::instrument(skip_all)]
@@ -130,16 +144,20 @@ impl ActivityHandler for BlockUserFromCommunity {
 }
 
 #[async_trait::async_trait(?Send)]
-impl GetCommunity for BlockUserFromCommunity {
+impl GetCommunity for BlockUser {
   #[tracing::instrument(skip_all)]
   async fn get_community(
     &self,
     context: &LemmyContext,
     request_counter: &mut i32,
   ) -> Result<ApubCommunity, LemmyError> {
-    self
+    let target = self
       .target
       .dereference(context, context.client(), request_counter)
-      .await
+      .await?;
+    match target {
+      SiteOrCommunity::Community(c) => Ok(c),
+      SiteOrCommunity::Site(_) => Err(anyhow!("Calling get_community() on site activity").into()),
+    }
   }
 }
diff --git a/crates/apub/src/activities/block/mod.rs b/crates/apub/src/activities/block/mod.rs
new file mode 100644
index 000000000..7460acec8
--- /dev/null
+++ b/crates/apub/src/activities/block/mod.rs
@@ -0,0 +1,144 @@
+use crate::{
+  objects::{community::ApubCommunity, instance::ApubSite, person::ApubPerson},
+  protocol::objects::{group::Group, instance::Instance},
+};
+use chrono::NaiveDateTime;
+use lemmy_api_common::blocking;
+use lemmy_apub_lib::{
+  object_id::ObjectId,
+  traits::{ActorType, ApubObject},
+};
+use lemmy_db_schema::{source::site::Site, DbPool};
+use lemmy_utils::LemmyError;
+use lemmy_websocket::LemmyContext;
+use serde::Deserialize;
+use url::Url;
+
+pub mod block_user;
+pub mod undo_block_user;
+
+#[derive(Clone, Debug)]
+pub enum SiteOrCommunity {
+  Site(ApubSite),
+  Community(ApubCommunity),
+}
+
+#[derive(Deserialize)]
+#[serde(untagged)]
+pub enum InstanceOrGroup {
+  Instance(Instance),
+  Group(Group),
+}
+
+#[async_trait::async_trait(?Send)]
+impl ApubObject for SiteOrCommunity {
+  type DataType = LemmyContext;
+  type ApubType = InstanceOrGroup;
+  type TombstoneType = ();
+
+  #[tracing::instrument(skip_all)]
+  fn last_refreshed_at(&self) -> Option<NaiveDateTime> {
+    Some(match self {
+      SiteOrCommunity::Site(i) => i.last_refreshed_at,
+      SiteOrCommunity::Community(c) => c.last_refreshed_at,
+    })
+  }
+
+  #[tracing::instrument(skip_all)]
+  async fn read_from_apub_id(
+    object_id: Url,
+    data: &Self::DataType,
+  ) -> Result<Option<Self>, LemmyError>
+  where
+    Self: Sized,
+  {
+    let site = ApubSite::read_from_apub_id(object_id.clone(), data).await?;
+    Ok(match site {
+      Some(o) => Some(SiteOrCommunity::Site(o)),
+      None => ApubCommunity::read_from_apub_id(object_id, data)
+        .await?
+        .map(SiteOrCommunity::Community),
+    })
+  }
+
+  async fn delete(self, _data: &Self::DataType) -> Result<(), LemmyError> {
+    unimplemented!()
+  }
+
+  async fn into_apub(self, _data: &Self::DataType) -> Result<Self::ApubType, LemmyError> {
+    unimplemented!()
+  }
+
+  fn to_tombstone(&self) -> Result<Self::TombstoneType, LemmyError> {
+    unimplemented!()
+  }
+
+  #[tracing::instrument(skip_all)]
+  async fn verify(
+    apub: &Self::ApubType,
+    expected_domain: &Url,
+    data: &Self::DataType,
+    request_counter: &mut i32,
+  ) -> Result<(), LemmyError> {
+    match apub {
+      InstanceOrGroup::Instance(i) => {
+        ApubSite::verify(i, expected_domain, data, request_counter).await
+      }
+      InstanceOrGroup::Group(g) => {
+        ApubCommunity::verify(g, expected_domain, data, request_counter).await
+      }
+    }
+  }
+
+  #[tracing::instrument(skip_all)]
+  async fn from_apub(
+    apub: Self::ApubType,
+    data: &Self::DataType,
+    request_counter: &mut i32,
+  ) -> Result<Self, LemmyError>
+  where
+    Self: Sized,
+  {
+    Ok(match apub {
+      InstanceOrGroup::Instance(p) => {
+        SiteOrCommunity::Site(ApubSite::from_apub(p, data, request_counter).await?)
+      }
+      InstanceOrGroup::Group(n) => {
+        SiteOrCommunity::Community(ApubCommunity::from_apub(n, data, request_counter).await?)
+      }
+    })
+  }
+}
+
+impl SiteOrCommunity {
+  fn id(&self) -> ObjectId<SiteOrCommunity> {
+    match self {
+      SiteOrCommunity::Site(s) => ObjectId::new(s.actor_id.clone()),
+      SiteOrCommunity::Community(c) => ObjectId::new(c.actor_id.clone()),
+    }
+  }
+}
+
+async fn generate_cc(target: &SiteOrCommunity, pool: &DbPool) -> Result<Vec<Url>, LemmyError> {
+  Ok(match target {
+    SiteOrCommunity::Site(_) => blocking(pool, Site::read_remote_sites)
+      .await??
+      .into_iter()
+      .map(|s| s.actor_id.into())
+      .collect(),
+    SiteOrCommunity::Community(c) => vec![c.actor_id()],
+  })
+}
+
+async fn generate_instance_inboxes(
+  blocked_user: &ApubPerson,
+  pool: &DbPool,
+) -> Result<Vec<Url>, LemmyError> {
+  let mut inboxes: Vec<Url> = blocking(pool, Site::read_remote_sites)
+    .await??
+    .into_iter()
+    .map(|s| s.inbox_url.into())
+    .collect();
+  inboxes.push(blocked_user.shared_inbox_or_inbox_url());
+  Ok(inboxes)
+}
diff --git a/crates/apub/src/activities/community/undo_block_user.rs b/crates/apub/src/activities/block/undo_block_user.rs
similarity index 72%
rename from crates/apub/src/activities/community/undo_block_user.rs
rename to crates/apub/src/activities/block/undo_block_user.rs
index a62315ddd..2c6a0bcf4 100644
--- a/crates/apub/src/activities/community/undo_block_user.rs
+++ b/crates/apub/src/activities/block/undo_block_user.rs
@@ -1,7 +1,9 @@
 use crate::{
   activities::{
+    block::{generate_cc, generate_instance_inboxes, SiteOrCommunity},
     community::{announce::GetCommunity, send_activity_in_community},
     generate_activity_id,
+    send_lemmy_activity,
     verify_activity,
     verify_is_public,
     verify_mod_action,
@@ -9,10 +11,7 @@ use crate::{
   },
   activity_lists::AnnouncableActivities,
   objects::{community::ApubCommunity, person::ApubPerson},
-  protocol::activities::community::{
-    block_user::BlockUserFromCommunity,
-    undo_block_user::UndoBlockUserFromCommunity,
-  },
+  protocol::activities::block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
 };
 use activitystreams_kinds::{activity::UndoType, public};
 use lemmy_api_common::blocking;
@@ -28,38 +27,46 @@ use lemmy_db_schema::{
 use lemmy_utils::LemmyError;
 use lemmy_websocket::LemmyContext;
 
-impl UndoBlockUserFromCommunity {
+impl UndoBlockUser {
   #[tracing::instrument(skip_all)]
   pub async fn send(
-    community: &ApubCommunity,
-    target: &ApubPerson,
-    actor: &ApubPerson,
+    target: &SiteOrCommunity,
+    user: &ApubPerson,
+    mod_: &ApubPerson,
     context: &LemmyContext,
   ) -> Result<(), LemmyError> {
-    let block = BlockUserFromCommunity::new(community, target, actor, None, context)?;
+    let block = BlockUser::new(target, user, mod_, None, None, context).await?;
 
     let id = generate_activity_id(
       UndoType::Undo,
       &context.settings().get_protocol_and_hostname(),
     )?;
-    let undo = UndoBlockUserFromCommunity {
-      actor: ObjectId::new(actor.actor_id()),
+    let undo = UndoBlockUser {
+      actor: ObjectId::new(mod_.actor_id()),
       to: vec![public()],
       object: block,
-      cc: vec![community.actor_id()],
+      cc: generate_cc(target, context.pool()).await?,
       kind: UndoType::Undo,
       id: id.clone(),
       unparsed: Default::default(),
     };
 
-    let activity = AnnouncableActivities::UndoBlockUserFromCommunity(undo);
-    let inboxes = vec![target.shared_inbox_or_inbox_url()];
-    send_activity_in_community(activity, &id, actor, community, inboxes, context).await
+    let inboxes = vec![user.shared_inbox_or_inbox_url()];
+    match target {
+      SiteOrCommunity::Site(_) => {
+        let inboxes = generate_instance_inboxes(user, context.pool()).await?;
+        send_lemmy_activity(context, &undo, &id, mod_, inboxes, false).await
+      }
+      SiteOrCommunity::Community(c) => {
+        let activity = AnnouncableActivities::UndoBlockUser(undo);
+        send_activity_in_community(activity, &id, mod_, c, inboxes, context).await
+      }
+    }
   }
 }
 
 #[async_trait::async_trait(?Send)]
-impl ActivityHandler for UndoBlockUserFromCommunity {
+impl ActivityHandler for UndoBlockUser {
   type DataType = LemmyContext;
 
   #[tracing::instrument(skip_all)]
@@ -106,7 +113,7 @@ impl ActivityHandler for UndoBlockUserFromCommunity {
 }
 
 #[async_trait::async_trait(?Send)]
-impl GetCommunity for UndoBlockUserFromCommunity {
+impl GetCommunity for UndoBlockUser {
   #[tracing::instrument(skip_all)]
   async fn get_community(
     &self,
diff --git a/crates/apub/src/activities/community/mod.rs b/crates/apub/src/activities/community/mod.rs
index 670b9a7b0..d8d8097eb 100644
--- a/crates/apub/src/activities/community/mod.rs
+++ b/crates/apub/src/activities/community/mod.rs
@@ -11,10 +11,8 @@ use url::Url;
 
 pub mod add_mod;
 pub mod announce;
-pub mod block_user;
 pub mod remove_mod;
 pub mod report;
-pub mod undo_block_user;
 pub mod update;
 
 #[tracing::instrument(skip_all)]
diff --git a/crates/apub/src/activities/mod.rs b/crates/apub/src/activities/mod.rs
index e09d69255..343633c8f 100644
--- a/crates/apub/src/activities/mod.rs
+++ b/crates/apub/src/activities/mod.rs
@@ -25,6 +25,7 @@ use tracing::info;
 use url::{ParseError, Url};
 use uuid::Uuid;
 
+pub mod block;
 pub mod comment;
 pub mod community;
 pub mod deletion;
diff --git a/crates/apub/src/activity_lists.rs b/crates/apub/src/activity_lists.rs
index 0512ed62c..c8666b93a 100644
--- a/crates/apub/src/activity_lists.rs
+++ b/crates/apub/src/activity_lists.rs
@@ -3,13 +3,12 @@ use crate::{
   objects::community::ApubCommunity,
   protocol::{
     activities::{
+      block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
       community::{
         add_mod::AddMod,
         announce::AnnounceActivity,
-        block_user::BlockUserFromCommunity,
         remove_mod::RemoveMod,
         report::Report,
-        undo_block_user::UndoBlockUserFromCommunity,
         update::UpdateCommunity,
       },
       create_or_update::{comment::CreateOrUpdateComment, post::CreateOrUpdatePost},
@@ -78,14 +77,22 @@ pub enum AnnouncableActivities {
   Delete(Delete),
   UndoDelete(UndoDelete),
   UpdateCommunity(UpdateCommunity),
-  BlockUserFromCommunity(BlockUserFromCommunity),
-  UndoBlockUserFromCommunity(UndoBlockUserFromCommunity),
+  BlockUser(BlockUser),
+  UndoBlockUser(UndoBlockUser),
   AddMod(AddMod),
   RemoveMod(RemoveMod),
   // For compatibility with Pleroma/Mastodon (send only)
   Page(Page),
 }
 
+#[derive(Clone, Debug, Deserialize, Serialize, ActivityHandler)]
+#[serde(untagged)]
+#[activity_handler(LemmyContext)]
+pub enum SiteInboxActivities {
+  BlockUser(BlockUser),
+  UndoBlockUser(UndoBlockUser),
+}
+
 #[async_trait::async_trait(?Send)]
 impl GetCommunity for AnnouncableActivities {
   #[tracing::instrument(skip(self, context))]
@@ -103,8 +110,8 @@ impl GetCommunity for AnnouncableActivities {
       Delete(a) => a.get_community(context, request_counter).await?,
       UndoDelete(a) => a.get_community(context, request_counter).await?,
       UpdateCommunity(a) => a.get_community(context, request_counter).await?,
-      BlockUserFromCommunity(a) => a.get_community(context, request_counter).await?,
-      UndoBlockUserFromCommunity(a) => a.get_community(context, request_counter).await?,
+      BlockUser(a) => a.get_community(context, request_counter).await?,
+      UndoBlockUser(a) => a.get_community(context, request_counter).await?,
       AddMod(a) => a.get_community(context, request_counter).await?,
       RemoveMod(a) => a.get_community(context, request_counter).await?,
       Page(_) => unimplemented!(),
diff --git a/crates/apub/src/http/routes.rs b/crates/apub/src/http/routes.rs
index 271c1b14e..c62a45ac8 100644
--- a/crates/apub/src/http/routes.rs
+++ b/crates/apub/src/http/routes.rs
@@ -11,7 +11,7 @@ use crate::http::{
   person::{get_apub_person_http, get_apub_person_outbox, person_inbox},
   post::get_apub_post,
   shared_inbox,
-  site::get_apub_site_http,
+  site::{get_apub_site_http, get_apub_site_inbox, get_apub_site_outbox},
 };
 use actix_web::{
   guard::{Guard, GuardContext},
@@ -28,7 +28,8 @@ pub fn config(cfg: &mut web::ServiceConfig, settings: &Settings) {
 
     cfg
       .route("/", web::get().to(get_apub_site_http))
-      .route("/site_outbox", web::get().to(get_apub_site_http))
+      .route("/site_outbox", web::get().to(get_apub_site_outbox))
+      .route("/site_inbox", web::get().to(get_apub_site_inbox))
       .route(
         "/c/{community_name}",
         web::get().to(get_apub_community_http),
diff --git a/crates/apub/src/http/site.rs b/crates/apub/src/http/site.rs
index 3439ef1d9..26be5f924 100644
--- a/crates/apub/src/http/site.rs
+++ b/crates/apub/src/http/site.rs
@@ -1,14 +1,17 @@
 use crate::{
-  http::create_apub_response,
+  activity_lists::SiteInboxActivities,
+  context::WithContext,
+  http::{create_apub_response, payload_to_string, receive_activity, ActivityCommonFields},
   objects::instance::ApubSite,
   protocol::collections::empty_outbox::EmptyOutbox,
 };
-use actix_web::{web, HttpResponse};
+use actix_web::{web, web::Payload, HttpRequest, HttpResponse};
 use lemmy_api_common::blocking;
 use lemmy_apub_lib::traits::ApubObject;
 use lemmy_db_schema::source::site::Site;
 use lemmy_utils::{settings::structs::Settings, LemmyError};
 use lemmy_websocket::LemmyContext;
+use tracing::info;
 use url::Url;
 
 pub(crate) async fn get_apub_site_http(
@@ -31,3 +34,17 @@ pub(crate) async fn get_apub_site_outbox() -> Result<HttpResponse, LemmyError> {
   let outbox = EmptyOutbox::new(Url::parse(&outbox_id)?).await?;
   Ok(create_apub_response(&outbox))
 }
+
+#[tracing::instrument(skip_all)]
+pub async fn get_apub_site_inbox(
+  request: HttpRequest,
+  payload: Payload,
+  _path: web::Path<String>,
+  context: web::Data<LemmyContext>,
+) -> Result<HttpResponse, LemmyError> {
+  let unparsed = payload_to_string(payload).await?;
+  info!("Received site inbox activity {}", unparsed);
+  let activity_data: ActivityCommonFields = serde_json::from_str(&unparsed)?;
+  let activity = serde_json::from_str::<WithContext<SiteInboxActivities>>(&unparsed)?;
+  receive_activity(request, activity.inner(), activity_data, &context).await
+}
diff --git a/crates/apub/src/lib.rs b/crates/apub/src/lib.rs
index 94752a397..4e33ba392 100644
--- a/crates/apub/src/lib.rs
+++ b/crates/apub/src/lib.rs
@@ -164,6 +164,10 @@ pub fn generate_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
   Ok(Url::parse(&format!("{}/inbox", actor_id))?.into())
 }
 
+pub fn generate_site_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, ParseError> {
+  Ok(Url::parse(&format!("{}/site_inbox", actor_id))?.into())
+}
+
 pub fn generate_shared_inbox_url(actor_id: &DbUrl) -> Result<DbUrl, LemmyError> {
   let actor_id: Url = actor_id.clone().into();
   let url = format!(
diff --git a/crates/apub/src/objects/community.rs b/crates/apub/src/objects/community.rs
index 8070c131a..4a618bf88 100644
--- a/crates/apub/src/objects/community.rs
+++ b/crates/apub/src/objects/community.rs
@@ -3,7 +3,7 @@ use crate::{
   collections::{community_moderators::ApubCommunityModerators, CommunityContext},
   generate_moderators_url,
   generate_outbox_url,
-  objects::instance::{instance_actor_id_from_url, ApubSite},
+  objects::instance::fetch_instance_actor_for_object,
   protocol::{
     objects::{group::Group, tombstone::Tombstone, Endpoints},
     ImageObject,
@@ -26,7 +26,7 @@ use lemmy_utils::{
 };
 use lemmy_websocket::LemmyContext;
 use std::ops::Deref;
-use tracing::{debug, info};
+use tracing::debug;
 use url::Url;
 
 #[derive(Clone, Debug)]
@@ -153,14 +153,7 @@ impl ApubObject for ApubCommunity {
         .ok();
     }
 
-    // try to fetch the instance actor (to make things like instance rules available)
-    let instance_id = instance_actor_id_from_url(community.actor_id.clone().into());
-    let site = ObjectId::<ApubSite>::new(instance_id.clone())
-      .dereference(context, context.client(), request_counter)
-      .await;
-    if let Err(e) = site {
-      info!("Failed to dereference site for {}: {}", instance_id, e);
-    }
+    fetch_instance_actor_for_object(community.actor_id(), context, request_counter).await;
 
     Ok(community)
   }
diff --git a/crates/apub/src/objects/instance.rs b/crates/apub/src/objects/instance.rs
index 333092b1f..cdd76c5a9 100644
--- a/crates/apub/src/objects/instance.rs
+++ b/crates/apub/src/objects/instance.rs
@@ -1,6 +1,5 @@
 use crate::{
   check_is_apub_id_valid,
-  generate_outbox_url,
   objects::get_summary_from_string_or_source,
   protocol::{objects::instance::Instance, ImageObject, Source, Unparsed},
 };
@@ -23,6 +22,7 @@ use lemmy_utils::{
 };
 use lemmy_websocket::LemmyContext;
 use std::ops::Deref;
+use tracing::debug;
 use url::Url;
 
 #[derive(Clone, Debug)]
@@ -82,7 +82,7 @@ impl ApubObject for ApubSite {
       icon: self.icon.clone().map(ImageObject::new),
       image: self.banner.clone().map(ImageObject::new),
       inbox: self.inbox_url.clone().into(),
-      outbox: generate_outbox_url(&self.actor_id)?.into(),
+      outbox: Url::parse(&format!("{}/site_outbox", self.actor_id))?,
       public_key: self.get_public_key()?,
       published: convert_datetime(self.published),
       updated: self.updated.map(convert_datetime),
@@ -167,6 +167,22 @@ pub fn instance_actor_id_from_url(mut url: Url) -> Url {
   url
 }
 
+/// try to fetch the instance actor (to make things like instance rules available)
+pub(in crate::objects) async fn fetch_instance_actor_for_object(
+  object_id: Url,
+  context: &LemmyContext,
+  request_counter: &mut i32,
+) {
+  // try to fetch the instance actor (to make things like instance rules available)
+  let instance_id = instance_actor_id_from_url(object_id);
+  let site = ObjectId::<ApubSite>::new(instance_id.clone())
+    .dereference(context, context.client(), request_counter)
+    .await;
+  if let Err(e) = site {
+    debug!("Failed to dereference site for {}: {}", instance_id, e);
+  }
+}
+
 #[cfg(test)]
 pub(crate) mod tests {
   use super::*;
diff --git a/crates/apub/src/objects/person.rs b/crates/apub/src/objects/person.rs
index 14245acf7..a4a6db9fa 100644
--- a/crates/apub/src/objects/person.rs
+++ b/crates/apub/src/objects/person.rs
@@ -1,7 +1,7 @@
 use crate::{
   check_is_apub_id_valid,
   generate_outbox_url,
-  objects::get_summary_from_string_or_source,
+  objects::{get_summary_from_string_or_source, instance::fetch_instance_actor_for_object},
   protocol::{
     objects::{
       person::{Person, UserTypes},
@@ -137,7 +137,7 @@ impl ApubObject for ApubPerson {
   async fn from_apub(
     person: Person,
     context: &LemmyContext,
-    _request_counter: &mut i32,
+    request_counter: &mut i32,
   ) -> Result<ApubPerson, LemmyError> {
     let person_form = PersonForm {
       name: person.preferred_username,
@@ -168,6 +168,10 @@ impl ApubObject for ApubPerson {
       DbPerson::upsert(conn, &person_form)
     })
     .await??;
+
+    let actor_id = person.actor_id.clone().into();
+    fetch_instance_actor_for_object(actor_id, context, request_counter).await;
+
     Ok(person.into())
   }
 }
diff --git a/crates/apub/src/protocol/activities/community/block_user.rs b/crates/apub/src/protocol/activities/block/block_user.rs
similarity index 70%
rename from crates/apub/src/protocol/activities/community/block_user.rs
rename to crates/apub/src/protocol/activities/block/block_user.rs
index 891fe1f55..690835d57 100644
--- a/crates/apub/src/protocol/activities/community/block_user.rs
+++ b/crates/apub/src/protocol/activities/block/block_user.rs
@@ -1,7 +1,4 @@
-use crate::{
-  objects::{community::ApubCommunity, person::ApubPerson},
-  protocol::Unparsed,
-};
+use crate::{activities::block::SiteOrCommunity, objects::person::ApubPerson, protocol::Unparsed};
 use activitystreams_kinds::activity::BlockType;
 use chrono::{DateTime, FixedOffset};
 use lemmy_apub_lib::object_id::ObjectId;
@@ -10,16 +7,19 @@ use url::Url;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
-pub struct BlockUserFromCommunity {
+pub struct BlockUser {
   pub(crate) actor: ObjectId<ApubPerson>,
   #[serde(deserialize_with = "crate::deserialize_one_or_many")]
   pub(crate) to: Vec<Url>,
   pub(crate) object: ObjectId<ApubPerson>,
   #[serde(deserialize_with = "crate::deserialize_one_or_many")]
   pub(crate) cc: Vec<Url>,
-  pub(crate) target: ObjectId<ApubCommunity>,
+  pub(crate) target: ObjectId<SiteOrCommunity>,
   #[serde(rename = "type")]
   pub(crate) kind: BlockType,
+  /// Quick and dirty solution.
+  /// TODO: send a separate Delete activity instead
+  pub(crate) remove_data: Option<bool>,
   pub(crate) id: Url,
   #[serde(flatten)]
   pub(crate) unparsed: Unparsed,
diff --git a/crates/apub/src/protocol/activities/block/mod.rs b/crates/apub/src/protocol/activities/block/mod.rs
new file mode 100644
index 000000000..75f169b8a
--- /dev/null
+++ b/crates/apub/src/protocol/activities/block/mod.rs
@@ -0,0 +1,20 @@
+pub mod block_user;
+pub mod undo_block_user;
+
+#[cfg(test)]
+mod tests {
+  use crate::protocol::{
+    activities::block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
+    tests::test_parse_lemmy_item,
+  };
+
+  #[actix_rt::test]
+  async fn test_parse_lemmy_block() {
+    test_parse_lemmy_item::<BlockUser>("assets/lemmy/activities/community/block_user.json")
+      .unwrap();
+    test_parse_lemmy_item::<UndoBlockUser>(
+      "assets/lemmy/activities/community/undo_block_user.json",
+    )
+    .unwrap();
+  }
+}
diff --git a/crates/apub/src/protocol/activities/community/undo_block_user.rs b/crates/apub/src/protocol/activities/block/undo_block_user.rs
similarity index 78%
rename from crates/apub/src/protocol/activities/community/undo_block_user.rs
rename to crates/apub/src/protocol/activities/block/undo_block_user.rs
index 02218367b..d3db580e4 100644
--- a/crates/apub/src/protocol/activities/community/undo_block_user.rs
+++ b/crates/apub/src/protocol/activities/block/undo_block_user.rs
@@ -1,6 +1,6 @@
 use crate::{
   objects::person::ApubPerson,
-  protocol::{activities::community::block_user::BlockUserFromCommunity, Unparsed},
+  protocol::{activities::block::block_user::BlockUser, Unparsed},
 };
 use activitystreams_kinds::activity::UndoType;
 use lemmy_apub_lib::object_id::ObjectId;
@@ -9,11 +9,11 @@ use url::Url;
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
-pub struct UndoBlockUserFromCommunity {
+pub struct UndoBlockUser {
   pub(crate) actor: ObjectId<ApubPerson>,
   #[serde(deserialize_with = "crate::deserialize_one_or_many")]
   pub(crate) to: Vec<Url>,
-  pub(crate) object: BlockUserFromCommunity,
+  pub(crate) object: BlockUser,
   #[serde(deserialize_with = "crate::deserialize_one_or_many")]
   pub(crate) cc: Vec<Url>,
   #[serde(rename = "type")]
diff --git a/crates/apub/src/protocol/activities/community/mod.rs b/crates/apub/src/protocol/activities/community/mod.rs
index 56332a877..77ffa9313 100644
--- a/crates/apub/src/protocol/activities/community/mod.rs
+++ b/crates/apub/src/protocol/activities/community/mod.rs
@@ -1,22 +1,21 @@
 pub mod add_mod;
 pub mod announce;
-pub mod block_user;
 pub mod remove_mod;
 pub mod report;
-pub mod undo_block_user;
 pub mod update;
 
 #[cfg(test)]
 mod tests {
   use crate::protocol::{
-    activities::community::{
-      add_mod::AddMod,
-      announce::AnnounceActivity,
-      block_user::BlockUserFromCommunity,
-      remove_mod::RemoveMod,
-      report::Report,
-      undo_block_user::UndoBlockUserFromCommunity,
-      update::UpdateCommunity,
+    activities::{
+      block::{block_user::BlockUser, undo_block_user::UndoBlockUser},
+      community::{
+        add_mod::AddMod,
+        announce::AnnounceActivity,
+        remove_mod::RemoveMod,
+        report::Report,
+        update::UpdateCommunity,
+      },
     },
     tests::test_parse_lemmy_item,
   };
@@ -32,11 +31,9 @@ mod tests {
     test_parse_lemmy_item::<RemoveMod>("assets/lemmy/activities/community/remove_mod.json")
       .unwrap();
 
-    test_parse_lemmy_item::<BlockUserFromCommunity>(
-      "assets/lemmy/activities/community/block_user.json",
-    )
-    .unwrap();
-    test_parse_lemmy_item::<UndoBlockUserFromCommunity>(
+    test_parse_lemmy_item::<BlockUser>("assets/lemmy/activities/community/block_user.json")
+      .unwrap();
+    test_parse_lemmy_item::<UndoBlockUser>(
       "assets/lemmy/activities/community/undo_block_user.json",
     )
     .unwrap();
diff --git a/crates/apub/src/protocol/activities/mod.rs b/crates/apub/src/protocol/activities/mod.rs
index 2aa488f57..47b01b241 100644
--- a/crates/apub/src/protocol/activities/mod.rs
+++ b/crates/apub/src/protocol/activities/mod.rs
@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 use strum_macros::Display;
 
+pub mod block;
 pub mod community;
 pub mod create_or_update;
 pub mod deletion;
diff --git a/crates/db_schema/src/impls/community.rs b/crates/db_schema/src/impls/community.rs
index d2b0d9cde..b2b3a6d81 100644
--- a/crates/db_schema/src/impls/community.rs
+++ b/crates/db_schema/src/impls/community.rs
@@ -122,9 +122,9 @@ impl Community {
       .get_result::<Self>(conn)
   }
 
-  pub fn distinct_federated_communities(conn: &PgConnection) -> Result<Vec<String>, Error> {
+  pub fn distinct_federated_communities(conn: &PgConnection) -> Result<Vec<DbUrl>, Error> {
     use crate::schema::community::dsl::*;
-    community.select(actor_id).distinct().load::<String>(conn)
+    community.select(actor_id).distinct().load::<DbUrl>(conn)
   }
 
   pub fn upsert(conn: &PgConnection, community_form: &CommunityForm) -> Result<Community, Error> {
diff --git a/crates/db_schema/src/impls/site.rs b/crates/db_schema/src/impls/site.rs
index d38ef9715..60d2c013c 100644
--- a/crates/db_schema/src/impls/site.rs
+++ b/crates/db_schema/src/impls/site.rs
@@ -54,4 +54,9 @@ impl Site {
         .map(Into::into),
     )
   }
+
+  pub fn read_remote_sites(conn: &PgConnection) -> Result<Vec<Self>, Error> {
+    use crate::schema::site::dsl::*;
+    site.order_by(id).offset(1).get_results::<Self>(conn)
+  }
 }
diff --git a/crates/db_schema/src/newtypes.rs b/crates/db_schema/src/newtypes.rs
index b863a2500..3e68768bc 100644
--- a/crates/db_schema/src/newtypes.rs
+++ b/crates/db_schema/src/newtypes.rs
@@ -10,6 +10,7 @@ use std::{
   fmt,
   fmt::{Display, Formatter},
   io::Write,
+  ops::Deref,
 };
 use url::Url;
 
@@ -125,3 +126,11 @@ where
     DbUrl(id.into())
   }
 }
+
+impl Deref for DbUrl {
+  type Target = Url;
+
+  fn deref(&self) -> &Self::Target {
+    &self.0
+  }
+}
diff --git a/src/code_migrations.rs b/src/code_migrations.rs
index 07a969ec5..161dd3b60 100644
--- a/src/code_migrations.rs
+++ b/src/code_migrations.rs
@@ -8,6 +8,7 @@ use lemmy_apub::{
   generate_inbox_url,
   generate_local_apub_endpoint,
   generate_shared_inbox_url,
+  generate_site_inbox_url,
   EndpointType,
 };
 use lemmy_db_schema::{
@@ -304,7 +305,7 @@ fn instance_actor_2022_01_28(
       name: site.name,
       actor_id: Some(actor_id.clone().into()),
       last_refreshed_at: Some(naive_now()),
-      inbox_url: Some(generate_inbox_url(&actor_id.into())?),
+      inbox_url: Some(generate_site_inbox_url(&actor_id.into())?),
       private_key: Some(Some(key_pair.private_key)),
       public_key: Some(key_pair.public_key),
       ..Default::default()