The Groundswell enabled by Social Media and Web 2.0

I stumbled upon a blog post today by Gareth Murran of ThirdForce titled: Groundswell in an e-learning 2.0 world.
In his post Gareth is referring to a book he has just finished reading:
Groundswell: Winning in a World Transformed by Social Technologies (Hardcover) by Charlene Li (Author), Josh Bernoff (Author)
The book focuses on how people are using [...]