We ask Silicon Valley investor and thinker Om Malik what Amazon's concept shop without cashiers says about the tech industry's attitude towards society. Plus we try the latest app from Blippar, which recognises faces in the street - will it be good for jogging your memory or just creepy? And Jane Wakefield reports on attempts by traditional media to combat online lies masquerading as news. With Mark Ward from the BBC Online tech desk, and special guest Rebecca Sentance, digital marketing blogger. (Image: Amazon Go concept storefront, Credit: Reuters).