Use follower address in user entry.

lib/pleroma/web/activity_pub/utils.ex

@@ -99,7 +99,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
       "type" => "Like",
       "actor" => ap_id,
       "object" => id,
-      "to" => [User.ap_followers(actor), object.data["actor"]],
+      "to" => [actor.follower_address, object.data["actor"]],
       "context" => object.data["context"]
     }
 
@@ -167,7 +167,7 @@ defmodule Pleroma.Web.ActivityPub.Utils do
       "type" => "Announce",
       "actor" => ap_id,
       "object" => id,
-      "to" => [User.ap_followers(user), object.data["actor"]],
+      "to" => [user.follower_address, object.data["actor"]],
       "context" => object.data["context"]
     }
 

lib/pleroma/web/ostatus/handlers/note_handler.ex

@@ -61,7 +61,7 @@ defmodule Pleroma.Web.OStatus.NoteHandler do
 
   def make_to_list(actor, mentions) do
     [
-      User.ap_followers(actor)
+      actor.follower_address
     ] ++ mentions
   end
 

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -12,7 +12,7 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
 
   def to_for_user_and_mentions(user, mentions, inReplyTo) do
     default_to = [
-      User.ap_followers(user),
+      user.follower_address,
       "https://www.w3.org/ns/activitystreams#Public"
     ]
 

test/web/twitter_api/twitter_api_test.exs

@@ -9,7 +9,8 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPITest do
   import Pleroma.Factory
 
   test "create a status" do
-    user = UserBuilder.build(%{ap_id: "142344"})
+    # user = UserBuilder.build(%{ap_id: "142344"})
+    user = insert(:user, %{ap_id: "142344"})
     _mentioned_user = UserBuilder.insert(%{nickname: "shp", ap_id: "shp"})
 
     object_data = %{