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I'm sure if you are one of the companies that Anonymous has targeted, you view their hats as very black indeed. In some ways, I agree. They force their social philosophy onto others through bully tactics, and at times call out opponents that aren't presenting a significant threat to society. I would point to their targeting Scientologists as an example. On the other hand, Anonymous does show the sometimes clueless consumer just how little protection some companies provide for their sensitive data. Sony's Playstation network would be one example of a company's lax security putting the private financial data of their customers at risk. Exposure of this lack of concern for customers through "hacktivism" serves a public good in my opinion, and results in more robust security measures than would otherwise be in place.