On the difference between Mastodon and Fediverse!
Mastodon is an open source social media platform that anyone can install and run on their own server to host their own communities like .art.
Fediverse is a contraction of Federated Universe. This is used as a catch-all term to include sites running software that can federate (communicate). They usually all run a thing called ActivityPub, which is the magic that lets them talk to each other.
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