I wrote a nano tool that tries to extract the #Fediverse accounts of your #Twitter followings: https://fedifinder.glitch.me/

It searches for the patterns @[email protected], [email protected] and host.tld/@user in the screen name, description, location and URL field. It displays them to you in the correct format for easy copying as well as a CSV download that can be imported to #Mastodon.

New version: https://fedifinder-backup.glitch.me/

Fedifinder

Fediverse accounts of your X/Twitter followings

@Luca this is helpful, thanks! Although it also seems to pick up youtube accounts for some reason lol
@HunterZ Thanks for the feedback. Some day it should check for ./well-known to make sure it only identifies fediverse stuff, but until then I manually excluded youtube.