Great article from Wired on Anonymous: How Anonymous Picks Targets, Launches Attacks, and Takes Powerful Organizations Down.
In the beginning, Anonymous was just about self-amusement, the “lulz,” but somehow, over the course of the past few years, it grew up to become a sort of self-appointed immune system for the Internet, striking back at anyone the hive mind perceived as an enemy of freedom, online or offline. It started as a gang of nihilists but somehow evolved into a fervent group of believers.