At the PlaNetwork conference on Social Networks. I recommend folks intrested in the ASN paper read Faceted Id/entity: Managing representation in a digital world by Dana Boyd
danah (also at conference) has taken an independent path to discover and document a similar approach to controlling online identities. She has done a wonderful job looking at the ways that people behave and the controls that society has developed to regulate personalities. In the context of the ASN paper, everyone should review here paper and look for the complements to the Augmented Social Network efforts.
These papers approach network building at the individual level. This approach is a little different but complementary to the approach that I advocate (focus on layering network supports ontop of the existing ad hoc nonprofit organization clusters to create networking..my paper)
The final must read that pops to mind is is Building sustainable communities thru network building by Valdis Krebs and June Holly. It is a careful look at social networks as they evolved in the Appalachian business community.