Unfortunately for all of you who though U.S. President Barack Obama was the hippest prez we have ever had, he does not tweet.  At town hall in Shanghai China, Obama  was asked "Should we be able to use Twitter freely?"  Obama told the crowd: Well, first of all, let me say that I have never used Twitter. My thumbs are too clumsy to type in things on the phone. Ironically, Obama's Twitter account -- one of the most popular with over 2.6 million followers -- lists 418 Tweets. I am not s...