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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.
They might end up being forced to, should Threads decide to revert.
Mastodon users will inevitably hook up on Threads communities instead of fostering their own, and at that point being left to their own devices would be a catastrophe.
And yes, this is exactly what happened to xmpp.