“Johan Bollen, associate professor at Indiana University School of Informatics and Computing, tells me how he discovered one possible edge: he’s done research that shows you can predict stock market moves from Twitter. You can measure public sentiment and then model it. ‘Society is driven by emotions, which it’s always been difficult to measure, collectively. But there are now programmes that can read text and measure it and give us a window into those collective emotions.'” via theguardian.