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Joy of the Fediverse
(beige.party)
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
I don't think you can. As of right now, you can follow and interact with Lemmy communities from Mastodon, but I don't think it works the other way around (as far as I can tell)