If you're building a social product, you're still living in the last century if your product doesn't work on Facebook.

The world is now awash in data and we can see consumers in a lot clearer ways.

Facebook and Myspace are the U.S. audience, which is tried and true when it comes to being susceptible to ads.

I think the hallmark of a really good entrepreneur is that you're not really going to build one specific company. The goal - at least the way I think about entrepreneurship - is you realize one day that you can't really work for anyone else. You have to start your own thing. It almost doesn't matter what that thing is.

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.

Facebook is so ubiquitous now that it's like another manifestation of the web itself.

As I was getting interviewed by the Wall Street Journal, or some big pub guy, all I remember was that he went off to the bathroom for a second, and they brought out my omelet. The next thing I remember, I woke up, and I was on the side of my own omelet, and there was no one at Buck's. Everyone was gone. They just let me sleep.