You're going to pull out your phone and try to use whatever is the most appropriate app on your iPhone or your Android device. Yelp saw that very early on. And when we launched the mobile product, we saw immediate growth, and we were stunned.

Mobile is the perfect example of what is enabling economic growth in the technology sector.

The single most important top-level trend is the shift to mobile.

What we want to do is make a leapfrog product that is way smarter than any mobile device has ever been, and super-easy to use. This is what iPhone is. OK? So, we're going to reinvent the phone.

Google Now is one of those products that to many users doesn't seem like a product at all. It is instead the experience one has when you use the Google Search application on your Android or iPhone device (it's consistently a top free app on the iTunes charts). You probably know it as Google search, but it's far, far more than that.

The mobile phone is not a toy; it's a device that uses radio waves.