A multinational security firm has secretly developed software capable of tracking people’s movements and predicting future behaviour by mining data from social networking websites. A video obtained by the Guardian reveals how an “extreme-scale analytics” system created by Raytheon, the world’s fifth largest defence contractor, can gather vast amounts of information about people from websites including Facebook, Twitter and Foursquare. Raytheon says it has not sold the software – named Riot, or Rapid Information Overlay Technology – to any clients…