Ident Engine
Glenn has taken Google's Social Graph API, YQL and various parsers, and he's wrapped it all up in one JavaScript library. The demos are mind-boggingly impressive.
Social networks may be imaginary | The Register
My new motto is "The Social Graph is a Spherical Cow."
Related links
Weak Ties, Twitter and Revolution | Wired Science | Wired.com
Responding to Malcolm Gladwell's recent piece in the New Yorker, Jonah Lehrer argues that the strength of weak ties *does* extend to social activism.
Is Happiness Catching? - NYTimes.com
An examination of behavioural contagion in social networks.
How your friends' friends can affect your mood - life - 30 December 2008 - New Scientist
The spread of happiness, obesity and smoking habits through social networks.