The problem I have with all these sites is that they are run by for-profit companies, which (for me) makes them untrustworthy. I would love to see a social networking site run by a democratic non-profit organization dedicated to freedom.
I'm working on OpenPhoto which is part of Mozilla's WebFWD program. It's as close as we've got considering the social components are not yet finished. https://webfwd.org/portfolio/#Open%20Photo