The ABC7 I-Team is investigating how police are using web pages and platforms to solve crimes and sometimes prevent them. Chicago could do that, according to a recent study of Chicago police crime data paired with Twitter traffic from certain neighborhoods. That combination, according to University of Virginia researchers, improved predictions for 19 of 25 crimes types including theft and assault. Even a tweet as simple as "I'm leaving for work" could tip off burglars... said Matthew Gerber, Ph. D, Predictive Technology Lab at University of Virginia.