California's Silicon Valley remains the center of the global internet industry. A number of Germans are also successful there.
42-year-old Holger Luedorf is one of them. He's one of the vice presidents of a successful company, Foursquare. He moved to California in 2005. Cyriac Roeding is another successful German IT entrepreneur. He was already doing well in Europe when, in 2009, he founded the Shopkick company with his US partner Jeff Sellinger. We meet the two in San Francisco and Redwood City and hear what they do and don't like about Silicon Valley.