The FBI is stepping up efforts to catch insider traders using social media sites. The FBI has been using recorded phone calls to track calls made by insider traders. It has also launched an application to track public posts to Facebook and Twitter. The application would then add other layers of information to the social network to the map, such as past incidents and locations of important buildings like embassies and military installations. An earlier version of this article incorrectly stated that the FBI had been using Skype messages to record insider trading calls. We are happy to clarify that this is not the case.”]