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 Let's not be reductive.
Facebook works, regardless of whether you have tech abilities or disposable income.
Facebook centralises and logs communication in a way that IRC never did.
Facebook is accessible and convenient af. Any competitor has to match that.
@USBloveDog @hhardy01 for my personal use, a feature. It's useful to have flawless, asynchronous group conversations, or the ability to search messaging history from any device. The issue, as always, is that it's also incredibly useful to those I don't want it to be useful to.