Twitter and Reddit. Arguably the biggest sources of fresh and current information at all. You want to know what is going on <em>right now</em>? 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.
Reaching the masses and keeping all of the mass content requires money, since investors are starting to realize that gazillions of views do not necesarilly equals profit, they are asking about ROI, which in turn makes the masses-reaching platforms look for ways to monetize those views, and that does not sit well with privacy caring people, but the masses don't care about that.
I really hope the masses never fill the fediverse with their nonsensical content.