Vine has climbed to the top of the U.S. App Store chart of free applications six months after its debut. The 6-second shareable video format from Twitter was booted from the App Store in an earlier iteration because of "adult" imagery and now sports a 17+ rating. New features as well as the release of a teaser for the new "The Wolverine" movie might have helped the app's popularity, Ken Yeung writes.

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