For years, Facebook has celebrated – boasted, even – about how quickly video advertisements were taking off on the social network. Then, a month ago, the company found something that has let some of the air out of that balloon: an algorithm it was using to tally up how much video people are actually watching was wrong. While Facebook said it was measuring the total time people spent watching a video divided by the number who played it, the firm found out that it was actually only logging the people who had viewed a video for three seconds or more. That could have inflated viewing numbers by as much as 60 to 80 percent, according to a Thursday report from the Wall Street Journal. And while Facebook says that it did not affect billing for those advertisers, the Journal reported that some ad buyers are very upset, having based their purchasing decisions on the network’s high numbers.
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