In one of the largest studies ever on mental health and internet use, the Oxford Internet Institute has declared that there is no “smoking gun” linking the internet with psychological harm. Professors Andrew Przybylski and Matti Vuorre studied data from two million people aged 15 to 89 in 168 countries, finding that in the last two decades of increasing online connectivity, there have only been minor shifts in global mental health. These findings seem surprising, rejecting the dangers we’ve long associated with overuse of social media. But the study itself admits its findings are lacking, since researchers don’t have access...