Chief Executive Officer at Twitter Dick Costolo gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).Chief Executive Officer at Twitter Dick Costolo gives a speech at the Cannes Lions 2012. The Cannes Lions International Advertising Festival is held for professionals in the communications industry (AP Photo/Lionel Cironneau).Maurice Levy of France, Chief Executive of Publicis speaks at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US actress and singer Selena Gomez gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US actress and singer Selena Gomez gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US former President Bill Clinton gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US former President Bill Clinton gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).Brazilian footballer and member local organising committee for the 2014 World Cup, Ronaldo gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US singer-songwriter, actress, lead singer Blondie, Deborah Harry gives a speech at the Cannes Lions 2012 (AP Photo/Lionel Cironneau).US singer-songwriter, actress, lead singer Blondie, Deborah Harry gives a speech at the Cannes Lions 2012(AP Photo/Lionel Cironneau).