Twitter and Reddit. Arguably the biggest sources of fresh and current information at all. You want to know what is going on right now? Go visit one of the two and you’ll be up to speed in a matter of minutes.
I don’t think the Fediverse will become mainstream. But I’m actually happy about that. And so should you.
I want the place to be just big enough that the real niche communities (mostly gaming) start blooming. After that, though, I’m good.