I've only recently joined this most bizarre of site... I have some (*coughs*) previous experience though of similar sites and I am generally DEEPLY sceptical of profiles until there is a modicum of evidence that it's a real person. I tend to check suspect photos on tineye dot com - which shows you every occurrance of a given image on the interweb :-) It's generally Pretty obvious when the person has simply uploaded a pic from somewhere else. Even if the photos don't fail this test, it's no guarantee that the person on the other end is the same sex, age, nationality or in some cases species so caution is always advisable.
I have wasted countless hours talking to people who actually turned out to be completely fictitious ! Which is very frustrating. Having spent a few hours trawling through this site, I reckon that in excess of 95% of the female profiles are fake or simply so old that the users have gone and got a life elsewhere. Hopefully talking on forums will bring out some real people :-)