Foursquare is a location-based social networking service that allows users to check-in at locations and earn points/badges. The document discusses Foursquare's features, partnerships, funding, and past promotional campaigns with brands like Zagat and Warner Bros. It then proposes a new promotional campaign called "The City is Your Playground" to increase members through a sweepstakes where users earn clues to check-in at 10 venues across cities to win the "Governor" badge. The campaign aims to boost awareness, referrals, and partnerships through competitive gaming.