Facebook today introduced 15-second video ads, which will start playing without sound as they appear on screen and stop if you scroll past. If you tap the video, it will expand into a full-screen view with sound. The company says users can expect to start seeing these new ads “over the next few months.” Facebook first started testing what it calls “Premium Video Ads” back in December. The company says they are designed “for advertisers who want to reach a large audience with high-quality sight, sound and motion.” Facebook sells and measures the new format similar to how media firms...

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