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 I think it's only the wrong question because the answer, broadly at least, is kind of obvious: pretty much anything that isn't centrally owned or operated.

(There are multiple reasons why we wouldn't want to go back to what came before.)

The real questions are:
1. What should it be about? (What's the concept?)
2. How can we get people to use it?

I have some fairly detailed ideas about #1.