I ran across this girl on pof and she's a 12... I messaged her and she started flirting back... I don't think she's real of course so I tested it (she's fake for sure haha)
My main method of exposing frauds is tineye! the reverse image search,
http://www.tineye.com/ basically you upload her pictures into the site and it will search a SMALL portion of the internet to find if the picture appears elsewhere outside a social network. Any search results on there is 99.9999% chance fake.
My second method is obviously look at her social networks. if you get to that point and her social networks have zero comments or interactions (or nothing but farmville) she's fake. Most single hot girls have very defined social networks, and if they don't they're not on it period.
thought i'd share...