Basically, you can either use a stock photo or upload your own (head/shoulders profile works best) and then by moving the mouse you control where the picture looks. Also, you can add expressions by clicking on one of emoticons, add audio, and then export/share your video.
Very easy to use and a lot of fun!!!
Click here for more info.
Below is a sample video I made using my oldest's pic from a few years ago. Look out Chucky/eTrade baby!!!