[danenania]

On that note, I wonder how much of these results are due to social media specifically and how much is caused by addiction to screens more generally, and the resulting insomnia, lack of exercise/time outside, and lack of human connection.

I know that in some respects, social media is uniquely bad, but perhaps the bulk of the problem is just being hooked on anything that makes you look at a phone or a screen all the time and neglect other aspects of life. Social media just happens to be the most popular thing currently to be hooked on.

[prawn]

I think you're on the right track. Personal screens consume so much time. Many of us defend it as just killing time, or researching, or keeping abreast of things but it eats up more than that until the average person feels harried and barely able to keep up. I know that's true for me.