"Social Media is Here to Stay... Now What?"
danah boyd addresses the Microsoft Research Tech Fest.
Social Networks Aren't Good Businesses - washingtonpost.com
An interesting take on the business models of social networking sites.
Related links
Twitter, Facebook, and social activism : The New Yorker
A well-argued piece by Malcolm Gladwell on the relative pros and cons of weak-tie networks and strong-tie hierarchies ...although, as always, Gladwell relies on anecdotes more than data to make his point.