from TheNextWeb ( http://thenextweb.com/apps/2015/02/11/future-gifs/ ):

While the GIF format was originally created to reduce image file sizes, it’s become part of the fabric from which the modern Web is woven. Now, a team of developers believe they’ve create the next step in its evolution.

YOYO lets you control animated GIFs by moving your mouse back and forth across the image. It’s an easy way to rewind, fast-forward and freeze the action.