If you've read Cialdini and Gladwell, you can skip this shallow attempt at repeating the deeper, more insightful and useful information shared by the aforementioned two other authors. In Messengers, Marks and Stephen provide their theories in shallow and overly presumptuous ways which would probably annoy the more well read and well versed reader and student of human behavior and psychology. Maybe I have read too many of these books by better researchers and authors. If I could return this book and get my money back I would. But it's too much trouble to return it. So I am recycling it. Save your money and read Cialdini, Gladwell, Csikszentmihalyi, Gardner, instead.