Re: Maybe it's because Facebook's moderators simply refuse to look.
And let's not even get into stego'd pics or pics that are used as very secret signals. As in the picture of the Grand Canyon is one thing while the one of Mount Rushmore is another. Most of these would require a First Contact to work, but I'd have to think that with at least some small thing in common, there could be a way to pass contextual messages around using nothing but innocuous pictures and no prior meeting.
Biting the hand that feeds IT
