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Threads: We've Seen This Before
(lemmy.world)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
There was no "Extinguish". XMPP still continues on.
By the way, Facebook also did the same. The original Facebook Messenger was based on XMPP as well.