AppNexus filters 65 percent of impressions as fraudulent

Ad fraud is top of mind in programmatic advertising, and the only debate is about the extent of the problem. Rather large, if you go by a bracingly frank presentation by AppNexus chief data scientist Catherine Williams at ExchangeWire’s ATS London event on Monday. According to Williams, filters deployed earlier this year by AppNexus flagged two thirds of its inventory (65 percent) as fraudulent.Read the full article