Groundswell is a hit for a number of reasons:
(1) It's current: Although published in 2011, the book is very up-to-date. This is good and bad, as very quickly it will become outdated.
(2) It's helpful: Instead of just listing advice for readers, like the groundswell itself, the book tries to relate to the reader. It gives plenty of case studies and real-life stories, and readers find themselves connecting with the authors.
(3) It's readable: It is written in such a readable fashion that anyone, tech-savvy or not, can enjoy it. While giving details of the groundswell concept, it also gives a basic overview of social media; none of the concepts are complicated or overbearing.
(4) It's about relationships: The book, while seemingly data driven and technology-focused, is really about relationships. "Never forget that the groundswell is about person-to-person activity" (280). Groundswell is about wielding our social media revolution to build and sustain relationships. Doing this requires patience, commitment and the right attitude.
Overall, it is an easy read, but it will train your mind to think differently about social media.