In many ways, this is a good summary of much of Casss Sunstein’s work (and arguably a more readable version of Under the Influence [review here]). Cass Sunstein focuses on the role of social norms in behaviour change, discussing their vital role in changing the way we think and behave, but also the ways in which they sometimes fail or are transformed.
Change is usually gradual, but sometimes revolution beats evolution and Sunstein explains why this happens. He also discusses the difference between individual behaviour changes, prompted by others, and the use of regulations and mandates, and why sometimes nudges are more effective.
This is a good read for anyone interested in the psychology of social change.