diff --git a/src/mastodon_toot_follower/conversation/conversation.py b/src/mastodon_toot_follower/conversation/conversation.py
index b708a10..a642d8b 100644
--- a/src/mastodon_toot_follower/conversation/conversation.py
+++ b/src/mastodon_toot_follower/conversation/conversation.py
@@ -2,31 +2,37 @@ from feedgen.feed import FeedGenerator
 from flask import url_for
 
 from mastodon_toot_follower import path_util
+from mastodon_toot_follower.conversation.reading_position import ReadingPosition
 from mastodon_toot_follower.mastodon_factory import MastodonFactory
 from mastodon_toot_follower.conversation.update import Update as ConversationUpdate
 
 
 class Conversation:
-    def __init__(self, mastodon_factory: MastodonFactory, mastodon_instance: str, toot_id: str, seed: str = ''):
+    def __init__(self, mastodon_factory: MastodonFactory, mastodon_instance: str, toot_id: str):
         self.mastodon = mastodon_factory.get_mastodon(mastodon_instance)
 
         self.toot_id = toot_id
         self.toot = self.mastodon.status(id=self.toot_id)
 
         escaped_uri = path_util.escape(self.toot["uri"])
-        if len(seed) > 0:
-            escaped_seed = path_util.escape(seed)
-            self.file = mastodon_factory.toot_cache_dir().joinpath(f'{escaped_uri}_{escaped_seed}.json')
-        else:
-            self.file = mastodon_factory.toot_cache_dir().joinpath(f'{escaped_uri}.json')
+        self.file = mastodon_factory.toot_cache_dir().joinpath(f'{escaped_uri}.json')
 
         # List of replies to initial toot.
         self.replies = self.mastodon.status_context(id=self.toot_id)['descendants']
 
-        self.previous_updates: list[ConversationUpdate] = ConversationUpdate.load(self.file)
-        self.new_updates = ConversationUpdate.get_new_updates(self.previous_updates, self.toots())
+        previous_updates: list[ConversationUpdate] = ConversationUpdate.load(file=self.file)
+        new_updates = ConversationUpdate.get_new_updates(previous_updates, self.toots())
+        self._updates = previous_updates + new_updates
+        if len(new_updates) > 0:
+            ConversationUpdate.save(updates=self._updates, file=self.file)
 
-        self._changes_saved = False
+    def get_and_update_reading_position(self, user_id: str):
+        filename = self.file.stem + '_ReadingPosition.json'
+        file = self.file.parent.joinpath(filename)
+
+        rp = ReadingPosition(file=file, user_id=user_id)
+        new_reading_position = len(self.toots())
+        return rp.get_and_set(pos=new_reading_position)
 
     def as_feed(self, feed_url) -> FeedGenerator:
         """
@@ -47,7 +53,7 @@ class Conversation:
         fg.language('en')
 
         update: ConversationUpdate
-        for update in self.updates():
+        for update in self._updates:
             fe = fg.add_entry()
             fe.id(update.dict['uri'])
             acct = update.dict['acct']
@@ -65,17 +71,14 @@ class Conversation:
     def conversation_length(self) -> int:
         return len(self.toots())
 
-    def toots(self) -> list:
+    def updates(self, reading_position: int = 0) -> list:
+        """
+        :param: reading_position: If given, returns only conversation updates after the reading position.
+        """
+        return self._updates[reading_position:]
+
+    def toots(self, reading_position: int = 0) -> list:
         """
         :return: List of initial toot and it's replies.
         """
         return [self.toot] + self.replies
-
-    def updates(self) -> list[ConversationUpdate]:
-        return self.previous_updates + self.new_updates
-
-    def save_changes(self) -> None:
-        if self._changes_saved:
-            return
-        ConversationUpdate.save(self.updates(), self.file)
-        self._changes_saved = True
diff --git a/src/mastodon_toot_follower/conversation/reading_position.py b/src/mastodon_toot_follower/conversation/reading_position.py
new file mode 100644
index 0000000..38325de
--- /dev/null
+++ b/src/mastodon_toot_follower/conversation/reading_position.py
@@ -0,0 +1,26 @@
+import json
+from pathlib import Path
+
+
+class ReadingPosition:
+    def __init__(self, file: Path, user_id: str):
+        self.file = file
+        self.user_id = user_id
+
+        if file.exists():
+            self.dict = json.loads(self.file.read_text())
+        else:
+            self.dict = {}
+
+    def get(self) -> int:
+        return self.dict.get(self.user_id, 0)
+
+    def set(self, pos: int):
+        self.dict[self.user_id] = pos
+        with self.file.open('w') as f:
+            f.write(json.dumps(self.dict))
+
+    def get_and_set(self, pos: int) -> int:
+        old_pos = self.get()
+        self.set(pos)
+        return old_pos
diff --git a/src/mastodon_toot_follower/main.py b/src/mastodon_toot_follower/main.py
index 89ce043..dc38b56 100644
--- a/src/mastodon_toot_follower/main.py
+++ b/src/mastodon_toot_follower/main.py
@@ -24,11 +24,16 @@ def main():
     conversation = Conversation(mastodon_factory=mastodon_factory,
                                 mastodon_instance=instance_url,
                                 toot_id=toot_id)
-    conversation.save_changes()
+    reading_position = conversation.get_and_update_reading_position('local_user')
 
+    print(f'Reading position: {reading_position}')
     print(f'Conversation length: {conversation.conversation_length()}')
-    print(f'Conversation updates:\n')
-    print('\n'.join([str(update) for update in conversation.new_updates]))
+    new_updates = conversation.updates(reading_position=reading_position)
+    if len(new_updates) == 0:
+        print('No new updates.')
+    else:
+        print(f'New updates:\n')
+        print('\n'.join([str(update) for update in new_updates]))
 
 
 def usage():
diff --git a/src/mastodon_toot_follower/server/flask_server.py b/src/mastodon_toot_follower/server/flask_server.py
index dee0446..9850f4f 100644
--- a/src/mastodon_toot_follower/server/flask_server.py
+++ b/src/mastodon_toot_follower/server/flask_server.py
@@ -36,7 +36,6 @@ def rss():
     instance_url, username, toot_id = mastodon_util.parse_toot_url(url=url)
 
     conversation = Conversation(mastodon_factory=mastodon_factory, mastodon_instance=instance_url, toot_id=toot_id)
-    conversation.save_changes()
 
     fg = conversation.as_feed(request.url)
     return Response(fg.rss_str(), mimetype='application/rss+xml')
@@ -49,10 +48,10 @@ def html(seed: str):
 
     conversation = Conversation(mastodon_factory=mastodon_factory,
                                 mastodon_instance=instance_url,
-                                toot_id=toot_id, seed=seed)
-    conversation.save_changes()
+                                toot_id=toot_id)
+    reading_position = conversation.get_and_update_reading_position(user_id=seed)
 
-    return render_template(Templates.updates.value, updates=conversation.new_updates)
+    return render_template(Templates.updates.value, updates=conversation.updates(reading_position=reading_position))
 
 
 @app.route('/json/<string:seed>/')
@@ -62,12 +61,11 @@ def json(seed: str):
 
     conversation = Conversation(mastodon_factory=mastodon_factory,
                                 mastodon_instance=instance_url,
-                                toot_id=toot_id,
-                                seed=seed)
-    conversation.save_changes()
+                                toot_id=toot_id)
+    reading_position = conversation.get_and_update_reading_position(user_id=seed)
 
     # If you return a dict or list from a view, it will be converted to a JSON response.
-    return [update.dict for update in conversation.new_updates]
+    return [update.dict for update in conversation.updates(reading_position=reading_position)]
 
 
 if __name__ == '__main__':
diff --git a/static/style.css b/static/style.css
index 3997e74..cb6750d 100644
--- a/static/style.css
+++ b/static/style.css
@@ -42,9 +42,3 @@
 .styled-table tbody tr:last-of-type {
     border-bottom: medium solid #009879;
 }
-
-/* Make the active row look different */
-.styled-table tbody tr.active-row {
-    font-weight: bold;
-    color: #009879;
-}