[luke_s]

As the poster has already pointed out, these are pics that people have already shared via facebook.

Computers sometimes allow us to do things was were already doing, except at a massive scale. Pre-napster, people were already able to share music with their friends via mix tapes, etc. Suddenly they were able to share with millions, without leaving their own home.

Similarly people were already able to scroll through their friends facebook albums for bikini pics. Suddenly they are able to to do it for 5 friends at once, with the click of a button. Changing the difficulty and scale of something can totally alter the dynamics of the situation. It will be interesting to see if services like this alter the behaviour of people 'oversharing' on facebook.