I found an interesting article on Social Capital in the Financial Express (Bangladesh).
Social capital and Sisimpur by Khan Ferdousour Rahman
The role of social capital in the creation of intellectual capital suggests that social capital should be considered in term of three clusters, i.e. structural, relational and cognitive. The structural dimensions of social capital relate to an individual ability to make weak and strong ties to others within a system. The relational dimension focuses on the character of the connection between individuals. This is best characterised through trust of others, their cooperation and the identification an individual has within a network. The basic premise is that interaction enables people to build communities and to commit themselves to each other, and to knit the social fabric.
A sense of belonging and the concrete experience of social networks and the relationships of trust and tolerance can bring greater benefits to the people. Trust between individuals thus becomes trust between strangers and trust of a broad fabric of social institutions; ultimately, it becomes a shared set of values, virtues, and expectations within the society as a whole. Without this interaction, on the other hand, trust decays; at a certain point, this decay begins to manifest itself in serious social problems.
Want to read more on social capital? try this link to wikipedia.