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A bug in a recent version of Twitter’s Android app inflated video advertising metrics by as much as 35%, a person familiar with the matter told Business Insider.
Twitter let advertisers know about the error earlier this week. The company has issued advertisers refunds for over-billing from video campaigns that ran on its social network between November 7 and December 12.
A Twitter spokesperson confirmed the bug in a statement on Thursday.
“We recently discovered a technical error due to a Twitter product update to Android clients that affected some video ad campaigns from November 7 to December 12,” the spokesperson told Business Insider. “Once we discovered the issue, we resolved it and communicated the impact to affected partners. Given this was a technical error, not a policy or definition issue, we are confident it has been resolved.”
The mishap comes at a time when Twitter faces mounting pressure to grow its ad business and attract new users. The company only added about 4 million monthly active users between the second and third quarters of 2016.
Twitter has also suffered a string of high-profile executive departures this year, including its longtime COO Adam Bain, VP of ad sales, head of media partnerships, and most recently its CTO and vice president of product. The company laid off 9% of its global workforce in October, including the team behind its standalone Vine app.
Twitter isn’t the only social network that’s reported incorrect ad metrics lately. Facebook has disclosed several miscalculations to advertisers in recent weeks, including that it had been inflating a key video-viewing metric on its platform for more than two years.