As far as I know this isn't a feature that exists, but I know the protocol should make it fairly easy.
What I'm thinking is for Lemmy to basically have the option to inherit the comment thread when posting a URL to another fediverse service.
E.g. If crossposting a Lemmy thread, you get a tickbox saying "inherit comment section" or something and it makes the new thread effectively a symlink to the original.
This could also be used to bootstrap other fediverse services like pixelfed and peertube by enabling people to comment directly from their Lemmy instance.
I think this would be simple ActivityPub-wise, but would be more complicated in terms of moderation and would involve some non-arbitrary decisions.
That would make sense, I'm pretty sure communities are already just actors who auto-boost posts.
This doesn't really make sense in the Lemmy model inherited from reddit. A post belongs to a specific community, you can't put one post in multiple communities. You can crosspost, and from there you can jump to the original and see its comments, but the comments on a crosspost belong to the second community.
Maybe a crosspost should not have a second comments section, and opening it should always send you to the original post, but I don't think that's desirable. For example, if I'm banned from the first community, should I be forbidden from commenting on the post when it's crossposted to my second community?
