Before, you had to be “vetted” by xitter staff as being both notable and who you said you were.

This made me think of an easy-ish way to do it for the fediverse:

1. You must have a Wikidata page, with at least one Wikipedia page associated with that Wikidata page
2. On the Wikidata page, you must have a P4033 property with that account
3. Add some ActivityPub metadata for "Account owner's Wikidata Item"
4. When there's a two way correspondance (Fediverse Account <-> Wikidata entry), show a Wikipedia logo which brings you to the corresponding Wikipedia article about the person.