It's really difficult to figure out exactly what impact social media and smartphones are having on adolescent mental health. From the perspective of academic debate, it’s really interesting—but academic debate is not helpful for parents who are stuck in the middle, trying to figure it out. What bothers me is that Haidt might have unnecessarily worried parents. There is a fear—a gut instinct that bad things happen on phones—that Jonathan Haidt has harnessed. There is some evidence to support him and and so he has written an extremely popular book, which tells a very neat story about how this is causing this massive wave of mental health problems and this huge soar in suicide, and it’s simply not true.