This week we're bringing you some of the ideas and voices from an event held in Cambridge to discuss power in the world of Facebook and Google. Where does Mark Zuckerberg end and Facebook begin? How are autocratic regimes taking advantage of the latest technology? Why is online shopping like the Truman Show? We talk with the people doing the most interesting research into how smart machines are changing the very basis of politics. It's scary, but it's also really interesting.