@jacqueline I'd just like to interject for a moment. What you're referring to as Mastodon, is in fact, Fediverse, or as I've recently taken to calling it, ActivityPub Fediverse. Mastodon is not a social network unto itself, but rather another free component of a fully functioning ActivityPub network made useful by the ActivityPub protocol, shell utilities and vital system components comprising a full "fediverse" as defined by ActivityPub.
Many computer users run a modified version of the ActivityPub system every day, without realizing it. Through a peculiar turn of events, the version of ActivityPub which is widely used today is often called "Mastodon", and many of its users are not aware that it is basically the Fediverse, developed by the ActivityPub Project.
There really is a Mastodon, and these people are using it, but it is just a part of the fediverse they use.
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