Facebook this month settled the 3 years litigation lawsuit around the metrics measured on video ad campaigns. Facebook acknowledged the error, however always denied that the measurement error had impacted the amount spent on ads by advertisers.
According to the motion on the United States District Court for the Nothern District of California, Facebook reached an agreement to settle the class action paying $40 million in cash. The litigation lasted 3 years. First lawsuit started in October, 2016.
The metrics in dispute were the Average Duration of Video Viewed, and the Average Percentage of Video Viewed.