The auto-playing ads will appear on both the desktop version of Facebook and the mobile app for Android and iOS phones. But the ads won’t gobble up a bunch of costly data while playing. Facebook said the videos will download ahead of time while the user is within range of Wi-Fi, not while using cellular data like 4G. The app has to be open for the ad to download. The video ad is stored on the phone – how much storage it takes up is an open question — and then played at the appropriate scroll point.

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economics, marketing, social networks, technology | December 17th, 2013