You're getting dressed, about to go out on a first date, and you can't decide which shoes to wear.
You're at a computer store buying a computer case for a friend, but don't know if she'll like the red one or the one with the rainbow pattern.
Which One? will let you take two pictures, post them side-by-side, and invite friends to vote on or choose which one they like better. When you can't decide, let your friends help you out with Which One?.