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(social.wake.st)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
They're both acceptable in English. The rule is generally "an" if the following word starts with a vowel. But, it gets a bit tricky with initialisms (like URL) because URL is normally pronounced something like "you-are-ell", and not "earl". So the spelling starts with a vowel, but the pronunciation doesn't. Nobody would fault you for using one or the other in a situation like this.