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" Kids started having their own cameras, en masse, in the 1960s. Kodak Instamatics, which came out in 1963, were inexpensive ($16) and easy to use, durable and small, the perfect size to fit in a child’s pocket or the upper tray of a footlocker on its way to summer camp. The Instagram logo, in a conscious nod, echoes the look of the early Instamatics—a dark stripe on top, metallic on the bottom, with a round flat lens and viewfinder in the middle. The "
― Nancy Jo Sales , American Girls: Social Media and the Secret Lives of Teenagers
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" For many girls, the pressure to be considered "hot" is felt on a nearly continual basis online. The sites with which they most commonly interact encourage them to post images of themselves, and employ the "liking" feature, with which users can judge their appearance and, in effect, rate them. When girls post their pictures on Instagram or Snapchat or Facebook, they know they will be judged for their "hotness," and in a quantifiable way, with numbers of likes. Social media, which gave us selfies, seems to encourage an undue focus on appearance for everyone, but for girls, this focus is combined with a pervasive sexualization of girls in the wider culture, an overarching trend which is already having serious consequences. "
― Nancy Jo Sales , American Girls: Social Media and the Secret Lives of Teenagers