Free startup idea: A/B testing for the masses

I was thinking about the idea of A/B testing that's often used on the web, where a company will put up two nearly-identical pages and measure which one is more effective. I think this idea, used with photos, could be turned into a really popular phone app.

Here's an example: Say a girl is rummaging through her closet trying to figure out which shirt to wear. She whips out her smartphone, launches the A/B app, takes a picture of herself wearing each of two shirts. Within 30 seconds, she has an answer of which shirt hundreds of strangers liked better. While she's waiting for the reply, she's prompted to rate other people's pictures. This is as simple as seeing two pictures and tapping the one that she likes more.

The number of use cases is endless. Say she's shopping for eyeglasses and trying to figure out which look better - she could try on both right there in the store and get a response from the A/B app. It doesn't have to be limited to fashion, as people could use it for any subjective comparison.

Users can be shown ads while waiting for their answer. They could also pay a small fee for faster responses, more responses, or even to break down the responses by gender, age group, or country (the app can ask these things when you install it.)

If the app is a success, it could be extended to integrate with social networks to allow people to see ratings from their friends.

Anyway, I'm already doing a startup so I'm not going to make this app. If anyone wants to run with this idea, feel free. I hereby place the entirety of this post into the public domain. If this helps you though, it would be cool if you wanted to cite me.

What does HN think? Have you heard of this being tried before? Do you think it could be a huge hit?