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#ActivityPub is a technical standard for connecting independent sites together to form a single giant network.

Mastodon users can follow people from other Mastodon sites because they all talk to each other through ActivityPub.

But there's more... AP also lets different kinds of sites talk to each other, so people on Mastodon can follow people on PeerTube, Pleroma etc.

AP services in development:
https://mastodon.at/@switchingsocial/100820109103853713

Some (very) technical details:
https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/

#AlternativesAtoZ