Neat. It's pretty much exactly what Color is trying to do, except it cost $41 million less to make.
Speaking of Color, you can use Color it in combination with this locator and this: http://www.digitaltrends.com/mobile/color-hack-allows-users-... to massively multiply your creep factor.
People love the new "everything is social" movement (twitter, FB, etc) and now color. The problem is that people don't realize what they are exposing and the conflict of interest is that these companies want EVERYTHING exposed so they can advertise/market.
That's the problem. People just don't get it. Or rather people don't realize the value their personal data has.