Ask HN: How do we solve the decentralized social network issue?

I've been studying on these decentralized services and learned that like a lot of types of web apps, there are a bunch of them claiming "we made the best service!" Personally, I would love for a decentralized social network to get traction, and I think the only think close enough is status.net/identi.ca (with about a million users on identi.ca). Ironically, app.net is obviously the most famous because they dared charge money. Can we developers unite under one service?