Tell that to Jadav Payeng, who planted a forest by himself. He accomplished, on his own, more for the good of the world than most communities on Facebook ever will.
https://interestingengineering.com/science/jadav-payeng-the-...
Eh, that's improvement, but the world didn't change because of a small forest.
Rural Facebook communities aren't trying to change the world. They're there for light conversation, gossip and organizing get-togethers.
It's important to note that Jadav didn't get other people to change and join his crusade before it happened. He merely went out and did what he wanted. People were inspired by seeing it happen.
People aren't going to be inspired by yet another social network touting federation and other technical mumbo-jumbo, because it doesn't help them do anything they weren't already doing on Facebook.
This whole conversation is very strange to me indeed.