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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Didn't there used to be some trick to force everyone to unfollow your Twitter account? My twitter accounts only exist to prevent name-squatting but it would please me for them to have 0 people following them.

UPDATE: The trick is to close your account, wait ~2 hours, then un-close it. That drops your followers to 0. (If you un-close immediately it doesn't work, you have to wait a bit.)