Our greatest thanks and appreciation go out to the many marketers who have helped us to write this book. Some of them helped directly—many indirectly. Having worked with and trained many marketers in workshops around the world, each of their questions and concerns helped us to keep searching for new ways to explain the concepts of social media and marketing effectiveness. These comments and inputs have now been used to put together this book on social media ROI. Each of us would also like to thank each of our interview participants in providing us great material for the case studies used and referenced throughout the book. They provided us input that we would have never been able to acquire and helped us to hone our thinking in putting this book together. Special thanks go to Peter Storer, with whom we've worked before and he is great at what he does. Thanks also go to Joel Balbin and Nick Melchior for keeping us on track and delivering a great manuscript.