PayPal once rejected a candidate who aced all the engineering tests because for fun, the guy said that he liked to play hoops. That single sentence lost him the job.

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

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.

You can have successful teams where people hate but deeply respect each other; the opposite (love but not respect among team members) is a recipe for disaster.

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

You can't get married to any one particular plan. That is the biggest lesson I learned at PayPal.

Right now, nearly all the apps on Facebook take a week to build. No more.