mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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der.hans

@bobjonkman @lanodan @cwebber I would consider StatusNet, identi.ca and pump.io to all be

Sure, we're now mostly using ActivityPub, but it's built on the pioneering Fediverse work that came before it

Some day the Fediverse might leave ActivityPub behind for Spritely or some other new interoperatbilty layer ( perhaps direct /dev/brain BitTorrent to keep our clones in sync )

The Fediverse isn't a protocol, it's a community-run network of interoperable services that AP today enables