Twitter is the preferred channel for quick banter for over 175 million users around the world including our political leaders. Over half of the heads of states and governments of the G20 meeting in Seoul on November 11 and 12 have an official Twitter account (http://twitter.com/Davos/G20). Some like @BarackObama have 5.5 million followers, while others such as the French Presidency only have 6,600.