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

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

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

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.

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.

The world is now awash in data and we can see consumers in a lot clearer ways.

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