Dennis's Big Idea

See Dennis.

Dennis is a multi-millionaire.

Doesn't just looking at his perky pose make you feel tired and slightly depressed?

Dennis Crowley is the 33-year-old co-founder of Foursquare, the 'fastest growing location-based social network'. The service, which has attracted more than two million users and is valued at $95m after just 16 months, allows its users to share [...:]