Social Capital

Social capital is strongly related to P2P since it is the value derived from interactions.

Here's a definition from one of the main resource pages on social capital.

URL = http://www.socialcapitalgateway.org/

"Social capital is generally referred to as the set of trust, institutions, social norms, social networks, and organizations that shape the interactions of actors within a society and are an asset for the individual and collective production of well-being. At the macro level, social capital can affect the economic performance and the processes of economic growth and development. These webpages contain useful resources for researchers, teachers, students, and practitioners interested in social interactions and social capital, in their role in the well-being of communities, and in their relationship with human, social and economic development." (http://www.socialcapitalgateway.org/)