@kudra @riggbeck @pluralistic a bit more than a decade ago, my swing dancing association realized that Facebook was a useful groupware tool.
You go to a dance class. When the class ends, there's a review. One student records the review and uploads it to the group, and everyone in the class Facebook group can then review the material. Also, it's where people tell the rest of the group if they will be absent.
With 8-10 different levels/classes per 'season' of 7-8 weeks and five seasons a year, that's about 50 new Facebook groups a year.
Since Facebook became the easy, 'free' choice for a service, we were unable to deliver on any other platform, nobody really looked for alternatives at the time, and now it feels like nobody developed any alternatives for the last decade or more.
Sucks.
Another association of mine, a social club, had a thriving web forum, but in the early tens, the traffic moved to Facebook. The functionality was less impressive than the self-hosted forum, but things seemed shinier and easier to use to most users, so the forum became a ghost site.
Here's to hoping that fediverse alternatives grows strong :/