Across its iOS and Android apps, Twitter is testing a new video experience that allows users to play clips with a single tap and see preview thumbnails in the timeline._The implementation is almost identical to how Vine videos are currently shown in its official mobile apps, with an image that stretches the width of the tweet and a blue play button in the center. Tap once and the video will begin automatically, with a pre-roll if necessary and a cross for dismissing the video in the top-right hand corner. A secondary tap will reveal some basic playback controls at the...

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