Foursquare is a local search and discovery mobile app founded in 2009 that has nearly 45 million users globally. It helps users discover popular nearby restaurants, bars, and other businesses based on their preferences and previous check-ins. Foursquare now generates revenue by charging businesses to be included on their maps and location data, and by selling targeted post-check in advertisements to users. While the app provides marketing benefits like special offers and tracking customer traffic, some risks include annoying users with too many irrelevant ads and requiring the separate app download.