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A thing I haven't found the answer to, neither in the ActivityPub standards or in the docs for setting up a mastodon server, is how federation takes place?

I get the parts that posts are sent to followers inboxes.

But what do mastodon servers (to limit the question, but feel free to jump in for other servers) do with public posts that ends up in one of their users' inboxes?

Do they put these posts in the public feed for their own users?

cont. in next post #activitypub #mastodon