Further to social network analysis studies

There are a number of sources for further research on the advanced applications of social analysis techniques to transaction and communication data.

Among the better overviews on the web can be found at John Robb's Global Guerrillas blog, about which more later.

Alternatively, one can go straight to the authoritative university sources, and there is no better place to start in depth research than at Carnegie Mellon's Center for Computational Analysis of Social and Organizational Systems (CASOS).

Lastly, its applications in intelligence are well proven through Marc Sageman's work, Understanding Terrorist Networks. A must read book for those in the professional space. An excellent overview talk by the author may be found here.