This was the conclusion of my dissertation! I looked at distributed groups and found 1) knowledge can be found outside of the individual (a switch from traditional KM models of expertise); and 2) the most valued employees were those that could access their knowledge networks when needed and TRANSLATE knowledge from one context to another. So it is not just the networks, it is also the ability to understand new information outside of a person's "expertise" and apply it to a new context.

One of my recommendations (which my committee made me cut) was to provide opportunities for individuals within an organization to meet and create networks. As you pointed out, a person can then maintain and expand those connections through social networks. However, I do believe there needs to be come collaborative social and work time face-to-face to develop the network bases. This is why conferences or organizational/interdepartmental meetings are still valuable.