Gregory's Server
@Mastodon
Did you know that mastodon.social is just one of many Instances of Mastodon the Software as Part of the Fediverse(federated Network) where you can register an Account?
And there are many other Apps on Android and iOS for it, not just Mastodon who tries to force you to register only on there Instance.
It has all the Stuff, being free, privacy-friendly, based on Web Standards and available for everyone. 😉