Everson, the vice president of global marketing solutions at Facebook, said clients and agencies were told of the miscalculation when it was discovered last month, but that it should have come clean sooner.
Appearing at a panel at Advertising Week in New York last night, alongside Pepsi global beverage group president Brad Jakeman and JPMorgan Chase chief marketer Kristin Lemkau, Everson said Facebook must do better.
The social media giant admitted last week that it had been overstating video view times for the last two years.
Everson also said Facebook "deeply believes" in third party verification and that it did not believe in marking its homework, citing its work with Nielsen and Moat during the discussion.
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