One big difference I see, between email and various messengers on the on side and social networks on the other side is, that emails are me pushing my information at people while a social network is supposed to be them pulling information from my feed. This allows me—when it works—to share stuff with people instead of potentially sending spam. Not all communication is a digital postcard. Social networks allowed a new form of communication. I enjoyed OG facebook until the first big privacy scandal. It was a (mostly) good thing and it was very accessible even then. I‘ve never got such a large part of my tribe on a pull service since then. Sure we all have messengers and groups and what not… but it is not the same. I dream of self-hosting something from the fediverse but we‘re not exactly young anymore and I doubt my tribe will assemble.