Holger Luedorf

Foursquare Labs Inc. provides free mobile location-based social networking services. Its application Foursquare, helps users to connect to friends and locations which they have visited. The firm's application can also be used as a marketing tool for businesses, brands and agencies. The company was founded by Dennis Crowley and Naveen Selvadurai in March 2009 and is headquartered in New York, NY.

Yahoo!, Inc. is a guide to digital information discovery, focused on informing, connecting, and entertaining users through its search, communications, and digital content products. It operates through the following geographical segments: Americas; Europe, Middle East, and Africa (EMEA); and Asia Pacific. The company was founded by Jerry Chih-Yuan Yang and David Filo in January 1994 and is headquartered in Sunnyvale, CA.

T-Mobile International AG & Co. KG provides telecommunications services. As strategic business segment of Deutschen Telekom AG for mobile telephony, the company concentrates on mobile telephony markets in Europe and the USA. The company is a partner of the FreeMove alliance, which they founded together with three other european mobile phone providers: Orange, Telefónica Móviles Espana and TIM (Telecom Italia Mobile). The company was founded in 1999 and is headquartered in Bonn, Germany.