What does Martin Luther have to do with Facebook? According to one historian, they both prove that networks have great power and can do a lot of harm. Marketplace Tech host Molly Wood talks with Niall Ferguson, whose new book is called “The Square and the Tower: Networks and Power, from the Freemasons to Facebook.”

What does Martin Luther have to do with Facebook? According to one historian, they both prove that networks have great power and can do a lot of harm. Marketplace Tech host Molly Wood talks with Niall Ferguson, whose new book is called “The Square and the Tower: Networks and Power, from the Freemasons to Facebook.”