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

Administered by:

Server stats:

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active users

Richard MacManus

Well they’ve finally done it — you can now follow Mastodon users from Threads (with some restrictions; see screenshot). Easiest way to test this is to search for your Threads account here, like the latest post, then check back on Threads. Follow your Mastodon self from there. Once this gets 100% functionality, I will hopefully be able to start pointing Threads users to my Mastodon profile.