And Haidt forcefully refuted this a couple years ago: https://www.afterbabel.com/p/phone-based-childhood-cause-epi...

I’m not sure highlighting studies that seem to agree with his thesis is a particularly strong defense against the charge that the totality of the evidence is mixed and inconclusive. He’s a good writer though.

Why did one study in Spain find an association with the rollout of high speed internet, but a much larger international study specifically looking at Facebook usage did not? Seems like that one should even more directly measure what’s alleged to be occurring.