If they are randomly there because someone took them and posted them without your real name or user name or email address, it will be nearly impossible to find.  It may even be simply a phishing attack if it was received via email, (IE: Dear 'Youremail@somedomain.com' --your picture and naked butt have been seen on a porno site click 'here' to view-- then takes you to some website were they say please give us your information--) Or may just be a 'pick-up' line such as "Hey Babe, I liked the Amateur Porn video I saw of you on the web last week" Very Similar to the 1970's classic "Weren't you the babe on the cover of Hustlert last month??" If you hear it again, ask them what the URL was/is. If it starts with something like "tinyurl.com/ Ignore it. It will be a fake site and will charge big bux to your credit card (Used to prove you are 18 or older).