Twitter Analyzed for Mood (image) Indiana University Caption Indiana University informatics professor Johan Bollen, right, was interviewed by media from around the world when he first published research detailing a mood tracking system of real-time Twitter activity and its correlation to stock markets. IU now has a patent on the invention. Credit Indiana University Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.