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

Don't let people tell you your ideas won't work. If you're passionate about an idea that's stuck in your head, find a way to build it so you can prove to yourself that it doesn't work.

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.

I learned early on not to feel badly about reaching out for help, and not to feel embarrassed about saying that you're in over your head.

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

Do what you love and the rest will come.