What inside look at Facebook says about Mark Zuckerberg

Wired magazine’s Steven Levy has reported on Facebook CEO Mark Zuckerberg for years. In his new book, "Facebook: The Inside Story," Levy draws upon that familiarity, as well as a young Zuckerberg's recently unearthed journals, for an intimate look at the social media giant -- including its reluctance to acknowledge warning signs due to a relentless focus on growth. Levy joins John Yang to discuss.