Why did Iran dominate twitter but Urumqi not?

Fresh off the BHTV presses is this absolutely fascinating discussion between Evgeny Morozov and Ethan Zuckerman about new media technologies, foreign policy and security. Both gentlemen are pioneers in this emerging field. Morozov is one of the only journalists covering this field and Zuckerman is the founder of Global Voices Online.  This is a gem of a diavlog. In the clip below, they compare social media’s role in recent events in Iran and Urumqi, China.   Enjoy.