There is no single site or app that is "Mastodon." This isn't like Twitter, or Facebook.
Mastodon.social isn't "Mastodon" anymore than Gmail is "email." Gmail is one very popular email server, Mastodon.social is one very popular #Mastodon server.
Same goes for mastodon.online, mstdn.social, mas.to, etc.
This seems to be tripping up a lot of new people during the #twittermigration to the #fediverse
@mike
Well.... Yes and no. It's more complicated than that but for sake of laymen's terms- yes.
The cost of power comes with the price of responsibility.
If you want freedom, you need to know how to find it- and work for it. There may even come a time where you might have to fight for it.
Hopping on the Fediverse requires the responsibility of learning a new ecosystem.
When in Rome, do as the Romans...