I have read most of Cal's books and they are good. His fight against social media is... I don't know, extreme. The problem to me isn't social media per se. The real problem is self-discipline/control. Cal crusades against social media, but I don't see him crusade against video games, or watching TV for example. I think a good/better metric is total screen time. My children are given an allowance in the form of screen…
The problem is that these things are what are being directly undermined. As humans we have for example a built in fear of what is now called FOMO; if the tribe was doing something and you weren't, your survivability was directly threatened. That's why it feels bad to be lonely, and good to be part of a mob. Facebook has weaponised human urges that operate below the level of rational thought. It's targeting the Intel Management Engine of our brains.