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- People under age 20 are becoming less enamored with Facebook, and more engaged by Snapchat and Instagram. Although the number of U.S. Facebook users overall has risen 2.4% (to 173M) in 2017, those aged 12 to 17 will drop by 3.4% (to 14.5M). While 82% of this age group currently frequents Facebook, only 76% of them are expected to do so in 2021. Teens continuing to visit Facebook typically log in less frequently,