How Skype Can Quickly and Easily Become a Social Network (and Clean Facebook’s Clock) : this is an interesting piece on the features of Skype that lend it to being a social network.
It's an interesting proposition, if only from the conceptual sense of having the full spectrum of realtime voice and video to IM to status updates and wall postings to messages and email to bookmarks and recommendations to games and apps, all under the same account, and available from most devices. Tantalisingly close to a fully converged communications platform: no more phone numbers or email addresses, just your name and a whole bunch of privacy settings to ensure that, while you're available anywhere, anyhow, it's only to the right people.
Skype already offers many of those things (I only found out recently that it did games), as does Facebook, of course. In fact, on reflection, the overlap looks so obvious - why doesn't one buy the other? Skype could do a nice client integration with Facebook. Both have their own walled gardens (skype audio/video technology is proprietary; Facebook owns any data you put on there). Seems like a perfect match.