People can copy what you've done, but they can't copy what you still want to do.

Don't let other people distract what you're doing. There's always haters.

Do what you love and the rest will come.

Building a product is easy. But building the company that builds the product is hard.

Stop sketching and start building.

Forget about where you want to be and go out and build stuff. Dodgeball came from being bored at work... things happen because you make them happen. Stop sketching, and start building.

I keep a notebook in my pocket, and I write down all the stuff we could ever do with Foursquare.