Cognitive Surplus: Creativity and Generosity in a Connected Age by Clay Shirky (2010). isbn 
Clay holds a joint appointment at NYU, as an Associate Arts Professor at the Interactive Telecommunications Program (ITP) and as an Associate Professor in the Journalism Department.
He is also a Fellow at the Berkman Center for Internet and Society, and was the Edward R. Murrow Visiting Lecturer at Harvard's Joan Shorenstein Center on the Press, Politics, and Public Policy in 2010.
In this 2008 presentation he sums up the Web 2.0 challenge as looking for the interactivity in every consumption activity, metaphorically looking for the mouse.
In a 2008 presentation he sums up the Web 2.0 challenge as looking for the interactivity in every consumption activity, metaphorically looking for the mouse.