Particularly common with selfies, because most people see photos of themselves and think it looks horrible (they're used to seeing themselves mirrored!) and wan

Particularly common with selfies, because most people see photos of themselves and think it looks horrible (they're used to seeing themselves mirrored!) and want to "touch up" the picture. Incidentally on a tangential note, this is why most front facing cameras on phones, tablets, and laptops mirror the video feed on your own screen: To trick your brain into thinking you look OK.