Big tech may look impervious to competition right now, but then so did Ford and General Motors in the 1950s. The history of American business is littered with dead and/or crippled behemoths. Bradley talks to Adam Fisher, author of the excellent "Valley of Genius: The Uncensored History of Silicon Valley, as Told by the Hackers, Founders, and Freaks Who Made it Boom', about why it will be competition, not government, that ultimately topples Google, Facebook and the rest.