Open source, decentralized, free range, organic electrons ... yadda, yadda. It's like Twitter but with a 500 character limit.
https://mastodon.social/about
If Twitter is dying I'm not sure that Mastodon has a chance, although it might be harder to censor in countries with repressive governments.
"Due to exceptionally high traffic, registrations on this instance are closed until quality of service can be assured for existing users. "
https://mastodon.cloud has MANY USERS - it's a start
O SWELL
https://mastodon.cloud/auth/sign_in
500 Internal Server ERROR