Los Angeles-based uSamp, the online surveying firm headed by Matt Dusig and Gregg Lavin, said today that it has launched a new London office. The firm said the new office is part of a European expansion for the company. uSamp said the new office comes after triple digit revenue growth last year, and a doubling of its employees since 2010. uSamp provides online survey and panel services, allowing market researchers to conduct online panels. uSamp said the new office will be overseen by Gaelle Normand.