diff --git a/app/activitypub/routes.py b/app/activitypub/routes.py
index 68bf24f1..694a968e 100644
--- a/app/activitypub/routes.py
+++ b/app/activitypub/routes.py
@@ -22,7 +22,7 @@ from app.activitypub.util import public_key, users_total, active_half_year, acti
     user_removed_from_remote_server, create_post, create_post_reply, update_post_reply_from_activity, \
     update_post_from_activity, undo_vote, undo_downvote, post_to_page, get_redis_connection, find_reported_object, \
     process_report, ensure_domains_match, can_edit, can_delete, remove_data_from_banned_user, resolve_remote_post, \
-    inform_followers_of_post_update
+    inform_followers_of_post_update, comment_model_to_json
 from app.utils import gibberish, get_setting, is_image_url, allowlist_html, render_template, \
     domain_from_url, markdown_to_html, community_membership, ap_datetime, ip_address, can_downvote, \
     can_upvote, can_create_post, awaken_dormant_instance, shorten_string, can_create_post_reply, sha256_digest, \
@@ -859,7 +859,7 @@ def process_inbox_request(request_json, activitypublog_id, ip_address):
                                     "id": f"https://{current_app.config['SERVER_NAME']}/activities/reject/" + gibberish(32)
                             }
                             # Lemmy doesn't yet understand Reject/Follow, so send without worrying about response for now.
-                            post_request(user.ap_inbox_url, reject, community.private_key, f"https://{current_app.config['SERVER_NAME']}/c/{community.name}#main-key")
+                            post_request(user.ap_inbox_url, reject, community.private_key, f"{community.public_url()}#main-key")
                         else:
                             if user is not None and community is not None:
                                 # check if user is banned from this community
@@ -888,7 +888,7 @@ def process_inbox_request(request_json, activitypublog_id, ip_address):
                                         "type": "Accept",
                                         "id": f"https://{current_app.config['SERVER_NAME']}/activities/accept/" + gibberish(32)
                                     }
-                                    if post_request(user.ap_inbox_url, accept, community.private_key, f"https://{current_app.config['SERVER_NAME']}/c/{community.name}#main-key"):
+                                    if post_request(user.ap_inbox_url, accept, community.private_key, f"{community.public_url()}#main-key"):
                                         activity_log.result = 'success'
                                     else:
                                         activity_log.exception_message = 'Error sending Accept'
@@ -1457,37 +1457,7 @@ def user_followers(actor):
 def comment_ap(comment_id):
     if is_activitypub_request():
         reply = PostReply.query.get_or_404(comment_id)
-        reply_data = {
-            "@context": default_context(),
-            "type": "Note",
-            "id": reply.ap_id,
-            "attributedTo": reply.author.public_url(),
-            "inReplyTo": reply.in_reply_to(),
-            "to": [
-                "https://www.w3.org/ns/activitystreams#Public",
-                reply.to()
-            ],
-            "cc": [
-                reply.community.public_url(),
-                reply.author.followers_url()
-            ],
-            'content': reply.body_html,
-            'mediaType': 'text/html',
-            'published': ap_datetime(reply.created_at),
-            'distinguished': False,
-            'audience': reply.community.public_url(),
-            'language': {
-                'identifier': reply.language_code(),
-                'name': reply.language_name()
-            }
-        }
-        if reply.edited_at:
-            reply_data['updated'] = ap_datetime(reply.edited_at)
-        if reply.body.strip():
-            reply_data['source'] = {
-                'content': reply.body,
-                'mediaType': 'text/markdown'
-            }
+        reply_data = comment_model_to_json(reply)
         resp = jsonify(reply_data)
         resp.content_type = 'application/activity+json'
         resp.headers.set('Vary', 'Accept')
diff --git a/app/activitypub/util.py b/app/activitypub/util.py
index 4f1cd1da..a99e5ad3 100644
--- a/app/activitypub/util.py
+++ b/app/activitypub/util.py
@@ -4,12 +4,12 @@ import html
 import os
 from datetime import timedelta
 from random import randint
-from typing import Union, Tuple
+from typing import Union, Tuple, List
 
 import redis
 from flask import current_app, request, g, url_for, json
 from flask_babel import _
-from sqlalchemy import text, func
+from sqlalchemy import text, func, desc
 from app import db, cache, constants, celery
 from app.models import User, Post, Community, BannedInstances, File, PostReply, AllowedInstances, Instance, utcnow, \
     PostVote, PostReplyVote, ActivityPubLog, Notification, Site, CommunityMember, InstanceRole, Report, Conversation, \
@@ -127,7 +127,7 @@ def post_to_activity(post: Post, community: Community):
     create_id = post.ap_create_id if post.ap_create_id else f"https://{current_app.config['SERVER_NAME']}/activities/create/{gibberish(15)}"
     announce_id = post.ap_announce_id if post.ap_announce_id else f"https://{current_app.config['SERVER_NAME']}/activities/announce/{gibberish(15)}"
     activity_data = {
-        "actor": f"https://{current_app.config['SERVER_NAME']}/c/{community.name}",
+        "actor": community.public_url(),
         "to": [
             "https://www.w3.org/ns/activitystreams#Public"
         ],
@@ -142,7 +142,7 @@ def post_to_activity(post: Post, community: Community):
                 "id": post.ap_id,
                 "attributedTo": post.author.public_url(),
                 "to": [
-                    f"https://{current_app.config['SERVER_NAME']}/c/{community.name}",
+                    community.public_url(),
                     "https://www.w3.org/ns/activitystreams#Public"
                 ],
                 "name": post.title,
@@ -154,21 +154,22 @@ def post_to_activity(post: Post, community: Community):
                 "sensitive": post.nsfw or post.nsfl,
                 "published": ap_datetime(post.created_at),
                 "stickied": post.sticky,
-                "audience": f"https://{current_app.config['SERVER_NAME']}/c/{community.name}",
+                "audience": community.public_url(),
                 'language': {
                     'identifier': post.language_code(),
                     'name': post.language_name()
                 },
-                'tag': post.tags_for_activitypub()
+                'tag': post.tags_for_activitypub(),
+                'replies': post_replies_for_ap(post.id)
             },
             "cc": [
-                f"https://{current_app.config['SERVER_NAME']}/c/{community.name}"
+                community.public_url()
             ],
             "type": "Create",
-            "audience": f"https://{current_app.config['SERVER_NAME']}/c/{community.name}"
+            "audience": community.public_url()
         },
         "cc": [
-            f"https://{current_app.config['SERVER_NAME']}/c/{community.name}/followers"
+            f"{community.public_url()}/followers"
         ],
         "type": "Announce",
         "id": announce_id
@@ -255,6 +256,52 @@ def post_to_page(post: Post):
     return activity_data
 
 
+def post_replies_for_ap(post_id: int) -> List[dict]:
+    replies = PostReply.query.\
+        filter_by(post_id=post_id, deleted=False).\
+        order_by(desc(PostReply.posted_at)).\
+        limit(2000)
+    return [comment_model_to_json(reply) for reply in replies]
+
+
+def comment_model_to_json(reply: PostReply) -> dict:
+    reply_data = {
+        "@context": [
+            "https://www.w3.org/ns/activitystreams",
+            "https://w3id.org/security/v1",
+        ],
+        "type": "Note",
+        "id": reply.ap_id,
+        "attributedTo": reply.author.public_url(),
+        "inReplyTo": reply.in_reply_to(),
+        "to": [
+            "https://www.w3.org/ns/activitystreams#Public",
+            reply.to()
+        ],
+        "cc": [
+            reply.community.public_url(),
+            reply.author.followers_url()
+        ],
+        'content': reply.body_html,
+        'mediaType': 'text/html',
+        'published': ap_datetime(reply.created_at),
+        'distinguished': False,
+        'audience': reply.community.public_url(),
+        'language': {
+            'identifier': reply.language_code(),
+            'name': reply.language_name()
+        }
+    }
+    if reply.edited_at:
+        reply_data['updated'] = ap_datetime(reply.edited_at)
+    if reply.body.strip():
+        reply_data['source'] = {
+            'content': reply.body,
+            'mediaType': 'text/markdown'
+        }
+    return reply
+
+
 def banned_user_agents():
     return []  # todo: finish this function
 
diff --git a/app/models.py b/app/models.py
index ee580842..625beca1 100644
--- a/app/models.py
+++ b/app/models.py
@@ -3,7 +3,6 @@ from time import time
 from typing import List, Union
 
 import requests
-from bs4 import BeautifulSoup
 from flask import current_app, escape, url_for, render_template_string
 from flask_login import UserMixin, current_user
 from sqlalchemy import or_, text, desc
diff --git a/app/utils.py b/app/utils.py
index fe3d2888..0cc1d940 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -17,6 +17,9 @@ from functools import wraps
 import flask
 from bs4 import BeautifulSoup, MarkupResemblesLocatorWarning
 import warnings
+
+from app.activitypub.signature import default_context
+
 warnings.filterwarnings("ignore", category=MarkupResemblesLocatorWarning)
 import requests
 import os