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.

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

I'm obsessed with the idea of social TV.

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.

One of the biggest hurdles about Foursquare is you need to remember to use it.

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

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