The documentation of Social Network Visualizer is a manual maintained in HTML format. It covers pretty much everything you need to know about social network analysis methods and network layout algorithms used SocNetV supported social network formats, graph creation, generation of random networks, automatic regeneration of famous data sets, etc. Click the link below to go to the Manual:
Also, there is a Software Requirements Specification document (PDF format) for Social Network Visualizer. Vaggelis Motesnitsalis was kind enough to prepare and contribute it. Please note that this PDF document refers to an older version.