> decentralized, text-based social network We had that. It was called Usenet, and it was great. Google destroyed it, so Facebook is going to own the next one from the get-go? Doesn't sound good.
Even if you set up your client to have your groups clean, for any new arrival without guidance it was a horrible experience that required a lot of effort in bringing signal out of the noise.
What killed it was not having a distributed spam filtering as it became popular.