Really, asking "what should replace Facebook" is putting things the wrong way around.
A more interesting way to ask the question is, "what did Facebook replace."
People used to build their own websites. People used to have blogs. People used USENET which was truly distributed and un-censorable.
Facebook and Google took the open internet and open standards and monetized and made everything crappy. Enough of that. Nothing should replace Facebook, it's done, stick a fork in it.
@hhardy01 Most of the people who now use Facebook to communicate did not, in fact, do those things. They still need to communicate online. They need a Facebook replacement.
I don't exactly know why FB became so popular.
For me it was the world wide reach, illusion of private space, and pointy clicky illusion of ease of use. Even though no real control and everything obfuscated.
It is hard for me as I'm leaving now because I have 2000 peeps and so many artists, musicians, writers, intellectuals, thinkers, internet OGs, models, rebels cool people. But if they are real they will come to me here if not let them go.
This is a private instance that @email@example.com is using for development and testing.