Vine is a video-sharing platform that, like Twitter, is all about abbrevation. Rather than posting videos that can go on for some time, like on YouTube, Vine videos can only last 6 seconds and are designed to loop much like animated GIF images. The shortened format is very similar to Twitter's 140-character text limit on tweets, and is a big reason why the startup app was so attractive to Twitter. Twitter bought Vine and has now incorporated the video service into Tweets. Video uploaded from your Vine account are posted directly onto the Twitter Card of your tweets like images.