Since I'm pretty much the only one (besides John Baez), I shall declare this the start of the new #MathMastodon community. Hopefully more folks join eventually.
@Pat the only one from #MathTwitter, after its downfall, of course. In all honesty I wasn't really expecting someone to see that post, let alone respond to it. Oh well...
There are a lot of math geeks here. @mc is a math guy, and there are many others -- mostly related to physics or computer science.
I'm not a math guy myself, at all, though.