Analysis of social networks using the Semantic Web

I want to talk about one study , interesting users of social networks. It is about the tool of communication in the style of Web 2.0 - social networks. The task of estimating network parameters (diameter, average route length in a network of friends, network leaders, etc.) is simple for a regular database: there are formulas for calculating network parameters (graph theory), write queries and get answers. But far from all parameters of a social network are dependent only on the structure of the graph. The meaning of connections (arc graph) for a social network is not the same. “I know him” and “this is my enemy” - different arcs within the meaning of the standard algorithms for calculating the parameters of a social network do not differ.