Don't let other people distract what you're doing. There's always haters.
Foursquare makes maps special. We take maps that are blank and put dots on them to help you figure out what to do.
Don't let people tell you your ideas won't work.
If there's something you want to build, but the tech isn't there yet, just find the closest possible way to make it happen.
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.