Very good review article on networks and learning at the Learning for Sustainability site, called Building networks for learning:

Social capital refers to those stocks of social trust, norms and networks that people can draw upon to solve common problems. But harnessing the power of these seemingly invisible networks to achieve sustainable development goals such as in public health, well being or environment is an elusive undertaking. All too often their power for supporting development is seriously underestimated. However, the downside is that misguided networking efforts can creates relational demands that sap people’s time and energy. So there is good reason to study networks, and determine the best way to manage them. The articles below offer three different perspectives of networking.

A related article I have to yet read fully is Network Capital: an Expression of Social Capital in the Network Society, which introduces the idea of network capital as a type of social capital:

This article deals with an emerging type of social capital which is labeled as ‘network capital’. It is formed from collaborative practices emerging from e-enabled human networks. It is proposed that network capital is a specific type of social capital in the Network Society, and that it holds significant value for the advancement of human development around the world.