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Sup is a New Messaging App by the Creator of Pixelfed
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Feels like Jabber has been around for a long time. If I'm not mistaken I remember my buddy pimping it as an AIM alternative back in the Napster/mp3 days.