I've had fun with Riya's face recognition capabilities, but have had difficulty in understanding the real intended use of the product/service. I went back to the original Riya Demo presentation video. And I'm still confused. I need to go read some other reviewers' takes on it.
HOW MANY FACES IN THIS PICTURE???
Riya does amaze though! It found my 17-year-old face, in cake frosting, in a photo from my 50th birthday party back in 2002.