"The logic is straightforward: In social and political situations, people often have private preferences that are costly to express. So they keep quiet to maintain social status or sometimes personal safety. They say and do what they think they are supposed to say and do to get along. Hence, the “Public Lies” part of [Kuran's] title. But sometimes the calculus changes. Sometimes a critical mass expresses a dangerous opinion. This empowers others to speak up. Then even more folks feel empowered. And then even more. And then there is a social revolution."