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What does this mean?
(lemmy.ml)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
You can do that, but if you don't want 20 different accounts, I would recommend signing up to just one. Lemmy and any other federated social media system should push posts from other servers to your feed depending on what servers are in region.