For several years, a data firm eventually hired by the Trump campaign, Cambridge Analytica, has been using Facebook as a tool to build psychological profiles that represent some 230 million adult Americans. A spinoff of a British consulting company and sometime-defense contractor known for its counterterrorism “psy ops” work in Afghanistan, the firm does so by seeding the social network with personality quizzes. Respondents — by now hundreds of thousands of us, mostly female and mostly young but enough male and older for the firm to make inferences about others with similar behaviors and demographics — get a free look at their Ocean scores. Cambridge Analytica also gets a look at their scores and, thanks to Facebook, gains access to their profiles and real names.