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OP didn't say it was only toxic for boys, just that it is for a lot of them.

He may have been referring to research that suggests girls generally cope better with the American school system's structure and approach than boys:

https://www.theatlantic.com/sexes/archive/2013/06/stop-penal...

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Yet. Teenage girls have a depression rate that has been rapidly increasing through the years. Currently at 20%. Which would suggest the increase in the use of social media is the main cause. Especially when this study did nothing to correlate against it with its weak argument for sleep which if you look at statistics on depression had no effect on it.

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