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.

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

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

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.

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

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.

We're becoming slaves to our social networks - and that's not a bad thing. You like your favorite networks, so do you friends, and pretty soon you have market winners.