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The Wikimedia Foundation has joined the fediverse by setting up their own Mastodon server!
(wikimedia.social)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
Best analogue I've heard is to think of it like email. Google can run Gmail, Microsoft can run Hotmail, and countless others can run their own email setups and everyone talks to each other just fine.
The fediverse is the same. Lemmy is made from a bunch of randos running their own Lemmy servers, but we all interact like it's one big Reddit-clone.