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@RookieNerd it’s a way for sub-communities within an ActivityPub instance to federate with other subs of the same kind.

If mysite.com/c/art subscribes to yoursite.com/c/art and a new post is made on yoursite, that post will be federated to mysite as well, as the same post rather than a separate cross-post as is now the case on the #threadiverse if I want to share some news about the fediverse with the different /fediverse subs.

It makes distributed common-topic conversation less fragmented.