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:

297K
active users

John Gruber

Turned off “fediverse” sharing on my Threads account. This may or may not turn into a useful feature for Threads users who don’t also have a Mastodon account, but I do (obviously, if you’re reading this), and I think for someone who has both a Threads account and Mastodon account, and sees the utility in participating in both as discrete platforms, Threads’s fediverse bridging is only an avenue for confusion.