On the Worldbank's Private Sector Development Blog, I found "an imaginary wish list of start-ups in a Development 2.0 world" (a post by Giulio Quaggiotto). One of the ideas on the wishlist is:  

One of the interesting things about social networks is that you get an insight in how people are connected with others and organized into subgroups of the total social network. Social networks make it very transparent how users are (or could be) linked to other users. These links can be made directly by the users (e.g. friends or contacts) or they can be established by the internet application based on the user generated data (e.g. people that share the same interest, location, organization, etc.). When these links and subgroups are established, the social networking application is then used to share and discuss information.

The web2fordev conference at FAO is currently in its 3rd and final day. The tagline for the event is "Participatory Web for Development", but in many ways I see it as a continuation of Netsquared.