Plot: Twitter co-founders Biz Stone and Jack Dorsey are interviewed. Nick Kristof (The New York Times top foreign correspondent), Martha Stewart, Alyssa Milano, Cory Booker (Newark, New Jersey Mayor), Gary Vaynerchuk (entrepreneur and author of The Thank You) and Katie Rosman (Wall Street Journal staff reporter and author of If You Knew Suzie) are also interviewed regarding their use of Twitter