Vine is actually pretty cool.

It’s made by Twitter, and as Russell Brandom writes, it’s pretty simple:

Shooting is remarkably simple. You start from a standard camera view, and hold down your finger to shoot. By tapping and releasing, you can easily shoot a quick montage without having to edit. A gradually filling bar above the viewfinder shows you how much time you have left. (There were rumors of a slow-motion mode for the iPhone 5, but we weren’t able to duplicate it. As far as we’re concerned, they’re still rumors.) One quirk: Vine doesn’t auto-rotate, so you have to shoot videos with your phone in portrait rather than landscape, or they come out sideways.

Videos play like a GIF with audio. Very clever, though the infinite looping can be a bit annoying.