Twitter's video-sharing mobile app Vine to close

By Amy Tennery NEW YORK (Reuters) - Twitter Inc announced Thursday that it would discontinue the video-sharing mobile app Vine, as it moves to cut 9 percent of its workforce worldwide to keep costs down after beating Wall Street quarterly earnings expectations. The decision comes on the heels of a failed attempt to sell Twitter as it fights against stagnant user growth and mounting competition from other social media platforms. In a post published jointly by Twitter and Vine to the blog platform