Surely that's not the best we can hope for—or work for. It is not out of the realm of possibility that distributed social networks, like email or Diaspora, can gain popularity. But I don't know how to make that appealing to average people.
If your concern is that a single entity is going to have your information, then Diaspora wouldn't help you anyways, as long as at least one of your friends is using a federated service that is a majority service (like blogger).
