Halfway through 2011, users on Twitter are now sending 200 million Tweets per day. For context on the speed of Twitter’s growth, in January of 2009, users sent two million Tweets a day, and one year ago they posted 65 million a day. For perspective, every day, the world writes the equivalent of a 10 million-page book in Tweets or 8,163 copies of Leo Tolstoy’s War and Peace. Reading this much text