labib is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
I briefly thought that theoretically infinite federate instances = no username or handle scarcity.
Turns out that every federated user has @federated.instance suffix to their username but users registered to mastodon.social don't.
Now I'm antsy for mastodon.social to reopen user registration.
