But what happens if you have 500 people in different rooms in the same building? "Detecting when people are taking pictures at roughly the same time in the sam

But what happens if you have 500 people in different rooms in the same building? "Detecting when people are taking pictures at roughly the same time in the same room" sounds like an awesome piece of technology with about zero practical uses in terms of iPhone apps. Sure, if you have a bunch of uncoordinated autonomous fly-robot things, it would be great to give them really cheap sensors and stitch everything together Dark Knight style, but who needs this in an iPhone app?