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with Facebook’s purchase of Instagram following the introduction of the front-facing camera. By 2012, many teen girls would have felt that “everyone” was getting a smartphone and an Instagram account, and everyone was comparing themselves with everyone else. Over the next few years the social media ecosystem became even more enticing with the introduction of ever more powerful “filters” and editing software within Instagram and via external apps such as Facetune. Whether she used filters or not, the reflection each girl saw in the mirror got less and less attractive relative to the girls she saw on her phone. While girls’ social lives moved onto social media platforms, boys burrowed deeper into the virtual world as they engaged in a variety of digital activities, particularly immersive online multiplayer video games, YouTube, Reddit, and hardcore pornography—all of which became available anytime, anywhere, for free, right on their smartphones. With so many new and exciting virtual activities, many adolescents (and adults) lost the ability to be fully present with the people around them, which changed social life for everyone, even for the small minority that did not use these platforms. That is why I refer to the period from 2010 to 2015 as the Great Rewiring of Childhood. Social patterns, role models, emotions, physical activity, and even sleep patterns were fundamentally recast, for adolescents, over the course of just five years. The daily life, consciousness, and social relationships of 13-year-olds with iPhones in 2013 (who were born in 2000) were profoundly different from those of 13-year-olds with flip phones in 2007 (who were born in 1994).
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Jonathan Haidt (The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of Mental Illness)