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Hackers have managed to make a huge video billboard in Atlanta display an obscene image favoured by internet pranksters. It prompted calls to police, and soon after, the billboard's owner cut off its power supply. The hack came after a security researcher warned the company, which runs thousands of the video billboards, that they were vulnerable to attack. The FBI and Homeland Security are now investigating the hack. The attackers are believed to have been able to take over the billboard because it used an easy-to-guess password on its net-connected remote administration system. The billboard