Boltanski and Esquerre draw on a vast repository of user comments left on the site of a major daily newspaper, as well as the thousands of comments posted on an online video site. They uncover what is sayable by comparing published comments with those deleted by moderators. They capture opinions in the course of their formation, rather than describing views which have long become cemented; these are often reflexive and wise, deriving from responses to interviews or opinion polls. They map out the parameters of politicization today, touching on various hot topics such as feminism, the environment, immigration, religion, nationalism and Europe.