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Facebook intentionally obfuscated the problem of overstated average watch times on paid video ads for more than a year, a group of digital marketers charged in court documents unsealed on Tuesday.
In September 2016, The Wall Street Journal reported that Facebook had been miscalculating the average time users spent viewing paid video ads by 60 to 80 percent. At the time, Facebook said the problem had existed for about a month and that it had been fixed.