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

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

If the game designer produces more content than he can consume per month, some fraction of the people will say more quests, more tests, more challenges, more whatever, and they will be compelled by it.

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.

Media is very different from financial services. People are very fickle and very vocal. They believe that things should be one way and not the other. It's still very rewarding to build products for huge audiences. It feels like you're making an impact.

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.