The scandal in which Cambridge Analytica harvested data from millions of Facebook users to craft and target advertising for Donald Trump’s presidential campaign has provoked broad outrage. More helpfully, it has exposed the powerful yet perilous role of data in U.S. society.
Repugnant as its methods were, Cambridge Analytica did not create this crisis on its own. As I argue in my forthcoming book, “The Known Citizen: A History of Privacy in Modern America,” big corporations (in this case, Facebook) and political interests (in this case, right-wing parties and campaigns) but also