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#TheFediverse is the name for a group of federated sites that use the #ActivityPub technical standard to talk to each other (including #Mastodon, #Pleroma, #PeerTube, #FunkWhale, #WriteFreely and many others).

#TheFederation means sites that use the Diaspora standard to talk to each other (most notably #Diaspora itself).

Some sites belong to both, and the definitions have shifted over time as new standards have been adopted. As the phrase goes, your mileage may vary.

#AlternativesAtoZ