The persistent use of botnets to perpetrate fraud online is driving advertisers to Facebook and Google, where they are reasonably assured that they are interacting with actual people, according to speakers at a Manhattan industry roundtable. Fraudulent impressions created by bots on ghost sites account for about 15% of total advertising, and the top culprits for fraudulent impressions are in-banner video, bid requests, exchanges and networks, per Integral Ad Science.

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