I don't do Facebook and never have but I did have a Myspace page that I killed last year. I had a couple of providers on my Myspace pages but they were not known to be escorts except by me since I knew them in a civilian way but met them first in the P4P realm.
I agree, it is a very bad idea to have either Facebook or Myspace, in general, just as Tweeter is but I was surprised at how many girls have those services and clearly using them for their promotion. I know Myspace has rule against it and I am pretty sure Facebook does too.
I have always thought it very stupid for a working girl to use those social networking sites from an IT perspective but then again, some folks are just looking for trouble. If you ever want a life after you "retire" from this realm, you better think clearly about your pictures, exposing your face and what not because those things stay once they are out there. Once your images are shown in regards to this world, you will have a very difficult time getting past the stigma of being an escort.