Pluralistic ignorance
In social psychology, pluralistic ignorance is a situation in which a majority of group members privately reject a norm, but go along with it because they incorrectly assume that most others accept it. This is also described as "no one believes, but everyone thinks that everyone believes". In short, pluralistic ignorance is a bias about a social group, held by the members of that social group.
Multitude
Multitude is a term for a group of people who cannot be classed under any other distinct category, except for their shared fact of existence. The term has a history of use reaching back to antiquity, but took on a strictly political concept when it was first used by Machiavelli and reiterated by Spinoza. The multitude is a concept of a population that has not entered into a social contract with a sovereign political body, such that individuals retain the capacity for political self-determination. A multitude typically is classified as a quantity exceeding 100. For Hobbes the multitude was a rabble that needed to enact a social contract with a monarch, thus turning them from a multitude into a people. For Machiavelli and Spinoza both, the role of the multitude vacillates between admiration and contempt. Recently the term has returned to prominence as a new model of resistance against global systems of power as described by political theorists Michael Hardt and Antonio Negri in their international best-seller "Empire" (2000) and expanded upon in their "" (2004). Other theorists recently began to use the term include political thinkers associated with Autonomist Marxism and its sequelae, including Sylvère Lotringer, Paolo Virno, and thinkers connected with the eponymous review "Multitudes".