Social networking is at a major fork in the road. Down one road is adding more features to a walled garden and opening up just enough, so that users seldom need to leave. Most sites are going down this yellow brick road and the prize is clearly a big one. But they may end up back in Kansas. Down the other road, lies a future of being the primary repository for your connections (aka the social graph), but with this data available via open APIs to anybody who needs it. That is a utility type model, and as with any utility, it can be hugely valuable at scale.