I found a few valuable social learning resources. Take a look at these slideshows below for several perspectives and best practices for using social learning at your organization.
Defining Your Social Learning Strategy
Social Learning and Internal Communications
Harnessing the Power of Social Networks in Teaching and Learning
Social Learning Success Stories, Models, And Roles
Also, be sure to check out these books:
Groundswell: Winning in a World Transformed by Social Technologies
SocialCorp: Social Media Goes Corporate (Voices That Matter)