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

Being an entrepreneur is not about being in love with an idea, it's about being in love with running a company.

The very first company I started failed with a great bang. The second one failed a little bit less, but still failed. The third one, you know, proper failed, but it was kind of okay. I recovered quickly. Number four almost didn't fail. It still didn't really feel great, but it did okay. Number five was PayPal.

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

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

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

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.