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Threads is officially starting to test ActivityPub integration
(www.theverge.com)
This is a most excellent place for technology news and articles.
What do you mean discovery feeds? Like the federated/all tab?
Because those feeds only show posts that the instance knows about, which is (mostly) posts from people that at least one person on your instance followed.
If you check the all tab on a small instance, it's a lot quieter than it is on something like mastodon.social.