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The hacker collective Anonymous struck again Thursday, launching its largest attack to date that temporarily brought down the websites of the Department of Justice and organizations that represent the movie and music industries.
But not everyone who helped with the attack was a willing participant. Many Internet users may have inadvertently contributed to the so-called "denial of service attack," which floods a website with traffic until it crashes, simply by clicking on a malicious link that circulated widely on Twitter, experts said.
