In the very influential book "Organizational Patterns of Agile Software Development by James O. Coplien and Neil B. Harrison, they discuss the use of socio-gram which map the communication relationships between people within an organization. This, they use to determine the health of a project, i.e the socio-gram should not indicate that there are silo's in communication. The same principles may be applied to Enterprise Architecture, and the socio-gram becomes a useful tool to analyze not only communication between individuals but also potentially between systems. The concept may also be used to establish a companies or individuals social networking "effectiveness" if we could create a tool to import all ones social networking contacts and map out the interactions with these over a period of time, we would certainly gain some insights into the effective network that we have built up.
I am interested in pursuing this idea, and starting to develop software to do just this. If there are any like-minded individuals out there who would be interested in using this concept in an Enterprise Architecture or Social Networking context, please contact me !