specifically because its intent is to provide both the threadiverse and twitterverse(?/microblog) interactivity, natively.

Well, yeah, but in the context of collectively talking about people who use communities (or as kbin puts it, magazines), it'd be the "Reddit-alike" functionality, rather than the "Twitter-alike".

I mean, I might also use IRC, and someone could even add support for IRC to one of the software packages, but then I'd be both an IRC user and a Reddit-alike user, even though I use both.

EDIT: Though that does kind of raise the question of whether there should be a generic for the "Twitter-alike" microblog environment. "Mastodon" is just one Fediverse microblogging package.