Twitter's new Vine video service hits 40M users since January

Vine, the video service introduced by Twitter in January, now has 40 million registered users, it said Tuesday. The mobile service, which lets users capture and share looping videos, had over 13 million users in June. The new figure for registered users, disclosed by Vine in a Twitter message, suggests that the concept of sharing short videos of up to six seconds duration has since taken off. Competitor Instagram, a photo-sharing service with over 130 million active users, introduced its own sho...