When I ask my acquaintances why they are still at fb, the answer is that they mostly use it to plan their free time - concerts, demos, birthdays, etc. I can completely agree with that, since I am no longer with fb, many things pass completely by me. @framasoft would like to build a federated alterantive and needs a few more donations. If you still have some money left for the rest of the month, please consider donating a small part of it.
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.