Better measurement is coming - I really liked this video that shows how the NYT is looking at how their content is shared.
It offers of course an "organic" perspective - reinforcing for me that new reality that is based on the model of nature rather than on the mechanics of a machine.
Already it is showing the importance of influence nodes - we see this is the spread of disease as well - the Typhoid Mary issue. Understanding this then enables us to understand where the systemic leverage comes from.
This I think takes us back to the math of Magic Numbers - a very few people count a lot. Their influence and how they get this is then central - that brings us back to the work of Klout.
We are getting there.