If you've arrived from Twitter and you want to find your friends from Twitter on here, there are some tools to do this:

🐦 Debirdify
https://pruvisto.org/debirdify

🔍 Fedifinder
https://fedifinder.glitch.me

🐑 Flock
https://mastodon-flock.vercel.app

Twitter said they were shutting down the API these tools rely on last Monday, but this doesn't seem to have happened yet.

So, for the moment these tools work, but they could stop working at any moment. If you're going to use them, this is possibly last chance to do so.