this thread may have the info you seek.
http://forums.gaywidewebmasters.com/...highlight=4472

right now, social networking sites don't collect i.d. for the explicit pics they post nor do sites that post user submitted explicit pics or videos. and at the risk of being yelled at, how do social networking sites know that the people who send in their pics are over 18 without i.d.? i know there was a case recently where some guy met a girl on a social networking site, banged her brains out and it turned out the girl was 14. so minors DO put up their profiles and pics...