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:

279K
active users

mcc

So the hover cards landed on mastodon.social… I didn't even make it a full day before creating a userstyle to forcibly disable them >_>