Completely anecdotal, but my siblings and cousins that are teens don't have Facebook, and most of their classmates don't either. It's weird to imagine a world where not everyone has Facebook, but I don't think it's as ubiquitous for those who grew up where alternatives existed, such as Snapchat and Instagram (even Twitter as well).
When I was young, we had nothing. Nothing but Facebook. Now take this expired Pocky and get off my lawn!
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