Already joined Mastodon and want to bring your friends? We've got a new post you can send them that walks through all they need to know to sign up:
https://www.eff.org/deeplinks/2022/12/how-make-mastodon-account-and-join-fediverse
How to Make a Mastodon Account and Join the Fediverse

The recent chaos at Twitter is a reminder that when you rely on a social media platform, you’re putting your voice, your privacy, and your safety in the hands of the people who run that system. Many people are looking to Mastodon as a backup or replacement for Twitter, and this guide will walk you through making that switch. Note this guide is current as of December 2022, and the software and services discussed are going through rapid changes.

Electronic Frontier Foundation

@eff

maybe EFF could run a couple temporary introductory instances. places we could send people to when they say "what instance should I join?" instead of all the other ones that are now getting huge. eff1.social and eff2.social etc. I bet people who don't even use them would donate to support them. a focused effort to take the load off @Gargron etc.