> The degree of harm is correlated with the degree of use, just like cigarettes. If you smoke a handful of cigarettes a year, it probably won't affect you much

> The degree of harm is correlated with the degree of use, just like cigarettes. If you smoke a handful of cigarettes a year, it probably won't affect you much at all. But if you use cigarettes multiple times a day for years, you'll do real harm to yourself. That's exactly true of Facebook. That's also true of just about anything humans can consume. For example, sugar.