So I thought, maybe GitHub is on mastadon and I search, here are the usernames that come up:
@github@hello.2heng.xin
@GitHub@mstdn.social
@github@mstdn.jp
@GitHub@mastodon.social
@github@m.gretaoto.ca
@GitHub@me.ns.ci
The last one uses a :verified: macro in the username to place a blue checkmark next to their name, another uses :github: to place the github logo in their username.Pretty interesting that you get to buy a domain name to solve the global username problem and have as many elonmusks as you like (for the viewers at home, impersonating elon is now a ban-able offense), but as for proving identity, when editing my mastodon profile and I see an option to verify that I control whatever links I post below my bio, by sticking an anchor tag in that webpage linking back to my mastodon profile. Smart, instead of being deemed worthy of a celebrity checkmark, you just prove you're the owner of X website.