Q Why is a Facebook user like a bald man in a photo booth?
A If the photo-booth algorithm uses eyebrows, instead of hairline, as a marker for "top of the head", a bald user may find that the top of his head (and his brain, presumably) has been lopped off in his photos. His individuality is not taken into account. Like Facebook, in which an algorithm assumes each user is like every other, some find that it lops off the top of their head.
Image credit: Christoph Hitz