Oh I simply love technology and the internet. The Paterva company which owns the Maltego application has setup a showcase which provides insight on the NSA visitors. The Maltego application has used the GEO-TAG information from people which have tweeted from the NSA parking lot to create a Google Map interface which provides insight on the visitors of the NSA environment.
The people have shared data to the internet which holds geo-information. This information is processed by the Maltego application. The Paterva company used open-source information, which means that they did not hack anyone. I believe that they did a very good job in making people aware of the information they share to the internet.