Usually the broken English gives it away. Also I have noticed that often the feedback writers often have a very low number of feedback themselves often (1), and very soon you find "member not active" as well.
If you want to be really sneaky, register with AW as a service provider that opens up a can of worms, (can be done if you want to I have more than on Internet provider)
Also I idle some time sometimes using a 3rd party site search tool to see how many which WG's share common fake profile writer. I know I should get out more (or less)
All I have really established is that a very high % of feedback is *o**ocks. I guess we all knew that though.
I keep a hotlist of all girls I have seen, Amazing how you can see a girl and a few days later you see a profile in this hotlist you don't recognise. new photos new name, same ol same ol baloney in profile.