If I see what you're up to on Facebook but I don't see your updates on Flickr, I'll still care about Facebook.

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

I have this massive notebook called IDEAS and another one called PERSONAL IDEAS and another one called CRAZY IDEAS.

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

Ignore your mistakes. The number one thing to worry about is -Am I doing what I'm good at?

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.