My colleagues and I often care for patients suffering from hallucinations, prophesying, and claiming to speak with God, among other symptoms—in mental health care, it’s sometimes very difficult to tell apart religious belief from mental illness…. Our conclusions frequently stem from the behaviors we see before us. Take an example of a man who walks into an emergency department, mumbling incoherently. He says he’s hearing voices in his head, but insists there’s nothing wrong with him. He hasn’t used any drugs or alcohol. If he were to be evaluated by mental health professionals, there’s a good chance he might be diagnosed with a psychotic disorder like schizophrenia. But what if that same man were deeply religious? What if his incomprehensible language was speaking in tongues?
If Facebook were a country, it would have the largest population on earth. More than 2.2 billion people, about a third of humanity, log in at least once a month. That user base has no precedent in the history of American enterprise. Fourteen years after it was founded, in Zuckerberg’s dorm room, Facebook has as many adherents as Christianity.
A couple of years ago, the company was still revelling in its power. By collecting vast quantities of information about its users, it allows advertisers to target people with precision—a business model that earns Facebook more ad revenue in a year than all American newspapers combined.