Is it your fault you’re addicted to Facebook, Candy Crush Saga, or whatever? Or are the web and all those apps scientifically designed to break your will? If so, shouldn’t they be regulated? These are questions Michael Schulson addresses in “User Behaviour”: “‘Much as a user might need to exercise willpower, responsibility and self-control, and that’s great, we also have to acknowledge the other side of the street,’ said Tristan Harris, an ethical design proponent who works at Google. (He spoke outside his role at the search giant.) Major tech companies, Harris told me, ‘have 100 of the smartest statisticians and computer scientists, who went to top schools, whose job it is to break your willpower.’”