"Analysts can glean much useful intelligence information from identifying relationships between individuals and groups, and tracking their activities. However, detecting networks of people and then investigating their activities are difficult tasks, especially in this era of information overload. Graph analysis has proven to be a useful tool for addressing these tasks, but it can be labor-intensive. To aid in this analysis, MIT Lincoln Laboratory researchers have developed a diffusion-based analytic that helps solve the problems of network discovery and prioritized exploration"
The above is directly from here: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.406.4523
In response, the BlueStreak Exploitation Tool has been developed, "to support data visualization, graph construction, algorithm services, and analyst collaboration within the network-discovery framework".
Tools and technologies used include the NetBeans Platform, NASA World Wind, JUNG, Apache Tomcat, and Apache ActiveMQ.
And here's the full PDF from the Lincoln Laboratory Journal, Volume 20, Number 1, 2013.