I stumbled across this CIO.com article by Michael Fitzgerald : Why Social Computing Aids Knowledge Management. (I missed it originally because it was not listed under the Knowledge Management articles on CIO.com.)
In fact, social computing represents a third wave for KM: the set of tools and processes companies use to create, track and share intellectual assets, says Patti Anklam, an independent consultant who is focused on KM and social networking. Anklam says the first wave involved digitizing and tracking documents using tools like content management systems. When it became clear that it was too hard to share those documents, companies adopted collaboration tools. With social networks, companies are extending knowledge management to make it easier to connect employees and information.
“A framework for knowledge management consists of understanding what you need to have in place so that people can connect and share with each other, and then…connect to people outside of their own current, small personal networks,” Anklam says.