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a Quora poster says "Some of the very first selfies were shot in mirrors with back cameras, because the front camera was no good, or the phone didn’t have a front camera at all. This still goes on, to show off the device that the shooter is using, or just to get a wider image."
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118 years ago cameras were a box with film and didn't have a screen that'd show you your face as you held it at arms length
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I'd guess looking in the mirror is by far the most common prompt for the thought "I should record what I look like". Or, probably even more common now, "I should share what I look like".