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What to know about Threads
(blog.joinmastodon.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
XMPP had its own problems outside Google Talk's use of that protocol, most notably that smartphones became a thing and the protocol at that time wasn't really suitable for environments where connections are lost all the time.