Facial recognition software can do more than just identify who you are. It can also tell how you're feeling and other things as well.
Face.com even has a Web page where you can give this technology a try. Click the link below.
Upload a photo, and it will tell you the mood of the person in the picture. It will also identify the individual's gender and report other details. It's designed for developers, but anyone can try it. (To use it, just click on the "upload photo" link in the left nav bar and choose a picture from your computer. Or, click "Use URLs" and paste in the URL of a picture online. Then click the "Call Method" button, and hover your mouse pointer over the picture for analysis.)
http://developers.face.com/tools/#faces/detect
