Social Media's growing pains

Available for over a year

Twitter plans to carry more advertising, but will users put up with it? We ask Adam Bain, the company's Global VP of Revenue. What kind of tech industry is there in North Korea, a nation in which internet access is blocked for ordinary citizens? The BBC's Steve Evans finds out. And we discuss hacker culture and the Anonymous collective with anthropologist Gabriella Coleman who has written a book about the movement. Our special guest is Victoria Richardson, worldwide mobile payments expert from the company Consult Hyperion. Presented by Rory Cellan-Jones, with Leo Kelion and Dave Lee from the BBC Online Technology Desk.