BuzzFeed News has confirmed a massive ad fraud scheme, which was originally uncovered by at least two fraud detection firms, that drained users' batteries and data. The scheme begins by hijacking the in-app advertisements of developers using Twitter's MoPub ad platform. It then silently runs autoplaying video ads behind legit banner advertisements, with the users being none the wiser. And since the video ads are still marked as completed even though none of the viewers got to see them, the scheme also rips off hapless advertisers. Protected Media, one of the anti-fraud firms that discovered the scheme, absolved Twitter of any wrongdoing -- the social network itself was merely exploited by the fraud's masterminds.