There was a discussion on an article in Hacker News about Scuttlebutt, posed as a possible replacement for FB in some respectives (a privacy-preserving friends network with no nefarious 3rd party data collectors and ads), and completely decentralized (and open-source).
I’ll include the non-technical intro video here (11 mn.) and the article + HN discussion in the (more technical) Towards the Vision of The Decentralized Web! topic.