Vine (http://vine.co) has been acquired by Twitter. It said "like Twitter, we want to make it easier for people to come together to share and discover what's happening in the world. We also believe constraint inspires creativity, whether it's through a 140-character Tweet or a six-second video."
Announcing Vine: A new way to share video. blog.twitter.com/2013/01/vine-n…
— Twitter (@twitter) January 24, 2013
Here's a few examples of the short looping video from Vine, on Twitter's blog: