Does not seems like a good fit for me. Apple is probably rethink its social networking strategy after Ping fails. Twitter API from within iOS is just more like a testbed. It has some form of messaging in FaceTime and the upcoming iMessage. It has a successful GameCentre social networking platform. We probably will see some social networking feature in iCloud v2 but I'm guessing it will serve a purpose such as for iTunes (Ping) or for games (GameCentre). Maybe for mobile payment purpose? Apple has the foundation for a commercial social networking platform as there is a large percentage of Apple ID that is tied to credit cards. We probably will see some hints of what to come at WWDC 2012.

Commercialisation is one reason why Google+ wants you to use real name. And I believe whatever Apple build, it will not be just Facebook like but rather have hints of social networking here and there.