BloombergQuint: Facebook and Google Have to Open Up

BloombergQuint: Facebook and Google Have to Open Up. “Martin Sorrell told you so. The WPP boss has railed against the opacity of Facebook and Google for years, calling for independent checks on the effectiveness of advertising on the sites. So when Facebook said on Thursday that it had overestimated the average viewing time for video ads on the social network for the past two years, the veteran ad man was proven right.”

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