The book, "Groundswell: Winning in a World Transformed by Social Technologies" by Forrester's Charlene Li and Josh Bernoff offered companies a much-needed framework for companies to understand social technologies and consumer behaviors. It also  introduced the now popular four-step process for developing a social media strategy. A lot has changed since we first interviewed Charlene Li about the Groundswell , including her move to begin the Altimeter Group .