Contagious: Why Things Catch OnA New York Times bestseller, Contagious explores why some ideas, products, and stories spread while others are quickly forgotten. Marketing professor Jonah Berger reveals the science behind word of mouth and why people share certain things with friends, colleagues, and online networks. Drawing on years of research, he explains how social influence shapes everything from the products we buy to the trends we follow. At the heart of the book are six key