I recently looked up Wikipedia's definition of social learning and to me, it seemed inadequate.
Here is the link (http://en.wikipedia.org/wiki/Social_learning_(social_pedagogy))...and I've pasted the text here:
Social learning refers to the acquisition of social competence that happens exclusively or primarily in a social group. Social learning depends on group dynamics. Social learning promotes the development of individual emotional and practical competence as well as the perception of oneself and the acceptance of others with their individual competencies and limitations.
After looking at the excellent slideshare presentation Kevin shared about Social Learning, I think we should be able to add more meat and improve the above definition.