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I've wondered, when articles write "teens aren't using Facebook" -- are they referring to young college students (17-19) or are they referring to middle/high schoolers?

Facebook was originally college-only, and high schoolers tend to emulate college students more than the other way around (in fact, I doubt any college student follows high school trends), therefore my guess is what Facebook is actually losing is young college students..? If they're losing high school students.. who cares.