主播大秀

As much as 50% of online ads are never viewed by humans, rather they're 'clicked' by bots, scam software designed to mimic human activity and defraud the advertisers. Ari Levenfeld from agency Rocket Fuel lifts the lid on a murky and complex world.

Also on the programme: Andrew Walker takes to the streets of London to explain the perils of deflation - now a threat in the Eurozone;
prize-winning author and journalist, and renowned Cuba expert Ann Louise Bardach joins us on Fidel Castro's 88th birthday to discuss the future of the isolated Caribbean island; and model Emma Ostergren joins us from Sweden to explain the thinking behind her firm Emma O Clothing, from which 60% of profit goes to its workers in Zimbabwe.