Author, teacher and activist, Clay Shirky, discusses the visionary insights of Marshall McLuhan as well as his own ideas about the effects of new media and social networking on our society. Shirky's latest book Cognitive Surplus explores how new technology is unleashing a wave of creative production that he believes is transforming the world. Following the lecture, Shirky sits down for an interview with broadcaster Jesse Hirsh. The event was part of the McLuhan 100 series at the International Festival of Authors at Harbourfront Centre.