Answered by Dennis Crowley co-founder of Foursquare

Here is a summary of the five pieces of advice, but make sure you click through to get all the nuggets of wisdom.

1. Stop sketching and start building.
2. Don’t let people tell you your ideas won’t work.
3. Build early and often.
4. Don’t let a lack of technology get in the way.
5. Hire the best people you can find.

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