The decentralized social network will never catch on. It's just too hard for most people to set up. Now I'm not saying it is hard, but most people are too apathetic to take the 15 minutes versus 15 seconds it would take to get it running. Superficially, this doesn't seem like a bad thing, as it would act like a filter and you'd only get people on the network who believed in it, which due to the whole domain that this falls in, may share a lot of common interests. But the appeal of a social network values quantity over quality. The thing that makes a social network useful is that everyone has it, not that only quality people have it, unfortunately. And this explains why I don't really "enjoy" facebook, but I do think it offers a lot of utility.