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himcolin With fraud becoming more sophisticated, the ad industry has started to fight back. While some companies hire outside security experts, many of the major players in the industry have their own security forces. The ad exchange AppNexus more than doubled its investigations unit in the past year. Google Inc.'s DoubleClick, one of the industry's largest exchanges, employs a geek squad of more than 100 quants, engineers, and Ph.D.s just for security purposes.