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Getting Tangled Up in Threads
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A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
You're completely right that there are likely to be major scalability issues, at this point I don't think anybody fully knows what the implications are, and it's not getting a lot of discussion. This is part of why Meta's proceeding slowly and presumably we'll see a lot of performance work over the next few months to deal with the expected onslaught.