With the massive supremacy of Facebook in the social networking space, it’s easy to assume that the door is closed for social network innovation. The reality, however, is that we’ve barely begun to scratch the surface of how we interact with and derive value and pleasure from our networks. There is good reason to think that even the way we think about who is in our social networks is going to undergo massive change, driven in part by our new access to strangers with common interests.

Great read on differences between the “social graph” – e.g. Facebook – and the “interest graph” – e.g. Twitter.