Biggest instances are https://mastodon.online https://mastodon.online and https://mastodon.social https://mastodon.social but there are a lot of it https://join

Biggest instances are https://mastodon.online https://mastodon.online and https://mastodon.social https://mastodon.social but there are a lot of it https://joinmastodon.org/en/servers https://joinmastodon.org/en/servers Also Mastodon isn't the only platform, there are some other activitypub compatible engines which are able to federate with Mastodon. https://en.wikipedia.org/wiki/Fediverse https://en.wikipedia.org/wiki/Fediverse https://fediverse.party/ https://fediverse.party/