In some instances, they are simply playing with you.
In the East Mids section, a known scam profile came up and a member immediately posted on her FB (only a comment I think), that she was a con-artist and that she should be avoided. He even went as far as saying read up about her on UKP. A few of us members even saw this, before she conveniently hid her FB.
When I rang the girl concerned, pretending to book her and enquired why her FB had been hidden, she gave me a bullshit story about how AW had hidden her FB by mistake and that she had tried and failed, "didn't know" how to get it sorted.