Watch live now: Twitter, Viacom and Sir Martin Sorrell on TV and social June 20, 2014 , Be the first to comment Twitter CEO Dick Costolo and Viacom president Philippe Dauman join WPP founder Sir Martin Sorrell at Cannes for an in-depth discussion on the symbiotic relationship between TV and social. News Don’t miss the livestream: More on this Topic In brief: Health Unlimited relocates, APCO and One hire, Volpa's Scottish brief Watch: Rankin and Photobox ask public to snap UK life for Children in Need project DWP rolls out flagship pensions campaign to persuade millions to save for retirement Case study: London Ambulance Service documentary boosts morale, public perception and recruitment Achoo! PHE urges public to 'Stay Well This Winter' to reduce preventable hospital admissions Have you registered with us yet? Register now to enjoy more articles and free email bulletins Register Already registered? Sign in Would you like to post a comment?Please Sign in or register.