By default when you install Mastodon on a domain, or subdomain, that will determine how the username of users on that Mastodon server will be. Example, if you install Mastodon on social.example.com a user on that server will be @myusername@social.example.com. This can be changed and you can install Mastodon on social.example.com but have your username be @myusername@example.com or even @myusername@differentdomain.com … Read More