Following a Lemmy community from an ActivityPub microblogging server such as Mastodon, Pleroma, or Misskey, sets the server to repost all messages sent to the community (whether original threads or their replies) as separate posts. However, both the threads and the replies to these have their ActivityPub privacy set to "public", instead of "unlisted". This means that on the home page, if you follow a Lemmy community, it will not only display the thread but also each individual reply in reverse chronological order. This generally pollutes the home page with more messages than required. While the main posts should remain with privacy set to "public", replies should be set to "unlisted" instead.