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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;
He's working on multiple things at once. Where he finds the energy, I don't know, but PubKit, Sup, and a few other things are all happening right now.
This one article is part of a series where I'm hoping to put up one feature per day of what he's been working on. Pixelfed is notoriously hard to cover, because the lead dev is so active.