Starting at 2 p.m. ET on Wednesday, President Obama will hold the first ever "Twitter Town Hall," to discuss jobs and the economy. The president will be speaking, not tweeting, but his questions will come from Twitter. Thousands of Tweets are already populating the #AskObama hashtag created for the event. But the White House says Obama will also answer questions that are asked on Twitter while the event is going on. Twitter will monitor hot tweets — those that have the most Retweets, Favorites, and Replies. Also, with help from visualization company Mass Relevance, Twitter will be mapping the big...