I do a presentation of the Fediverse to my college students and will soon be giving short workshops to organization as well. I realize that a viable, decentralized altenative to Facebook is IMO the biggest missing piece of the puzzle. We need something that offers some kind of central platform for networking, events, groups

Well, there’s Mattermost and there’s just a plain old Matrix server. Both are better-suited to collaboration projects than Facebook ever was. I’d argue the only reason it ever morphed into that role in the first place was because everyone was on there, it had little to do with features.