So here’s a funny thing about Facebook videos: it turns out people actually weren’t watching the ads on them nearly as much as the social network said. The Wall Street Journal reports that since it introduced video ads in 2014, the company miscalculated average viewing time because it didn’t include views that lasted less than three seconds. An ad buying agency says it was told by Facebook that average time spent viewing was likely overestimated by 60 to 80 percent.
