With the clima.me tweeter tracking tool you can watch for sudden rises and falls in twitter level in these locations. Sudden rises or sudden falls in Twitter, especially at night, may indicated public disturbances or fires.
The Clima.me tool measure the intensity of tweeting on mobile phones and tablets in a given location. You can go anywhere on a map to get the current score. The Clima.me score is between 0-100 with 0 being no tweeting currently and 100 being active. The ToS for Clima.Me is here.