@downey In my experience, I see people here most often refer to it as "fedi(verse)". I think it would be a bit odd to refer to the technical protocol like calling your email address "SMTP". I think "Mastodon" gives the misleading impression that you have to use Mastodon to contact you at that address.
@be Yes, I tend to agree. But then again there's Matrix, which is the name of the protocol; and while (no longer) the client, there's no term for it more encompassing than that.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.