I just read the Social Learning Handbook by Jane Hart. The book was a great review of many of the sites we use in our Professional Development and graduate class. Jane does a great job connecting the "tools" with the role and desire to learn. A quote from the book regarding social media "This is an essential and defining point about social media; It has turned the concept of "learning" on its head. It's no longer about waiting to be taught or trained, but about individuals having the power in their own hands to deal with the learning problems much more quickly and efficiently than before."
The book looks at both theory and practice. In the first part of the book there is a focus on the worplace and learning the difference beween training and social learning. The second part looks at many of the key social technologies and how they can be used to work smarter. (More on the contents ) Below is a presentation to support the book and links to the the sitehttp://c4lpt.co.uk/