Boomerang creates one-second looping videos with no sound. To use it, you find something that's moving (that's the whole point of it) and tap one big button. The app then quickly takes 10 photos and plays them forward and backward to make a looping Boomerang video.
After you have your video, you can share it to Instagram or Facebook, as well as to other apps on your phone. The videos are added to your Camera roll or Gallery. If you share a Boomerang on Instagram, you still get to use filters to edit it before you post it.
Basically, this is Instagram's take on the recent trend of short videos or animated photos - be they Vines, GIFs, or Apple's Live Photos.
How does the video moves in just 1 sec? This is so stupid. I rather record 5second video. People not going to tap for sound anyway. Same idea same feature.
lol. your comment cracked me up. nice one