just for organisational purposes I feel whatsapp or wechat groups do a lot of what you're describing (except for the ease of photo tagging), and it leaves out all the stressful and annoying newsfeedy things you get on facebook. Which I think is pretty crucial, because that's all the social and data and ad driven stuff that facebook essentially runs on.

In general there seems to be, especially among younger people, a tendency back towards smaller communities, fewer strangers, less agitation and so on. Youtube, Patreon and Twitch creators seem to be particularly successful.