FOAF

sing me to sleep
FOAF (friend of a friend) data can be used to generate quantitative analysis of social networks. This is applied to blogging sites in this paper. Paolillo and Wright suggest that patterns of interest and social interaction are closely interwoven for a central core of users. These users have strong ties, know each other well and spend time together. However, the majority of interactions are more diffuse, and weak ties predominate. I think that's just about true in the case of vistors to my blog.