I also wonder why people use fake pictures (especially girls) for their profile, I understand that you don't want somebody to know what you look like, but its weird that they pretend to be someone else.
Most Helpful Guy
I think using an a picture that is not misleading such as anonymous picture, or a non-identifying picture (such as mine) is fine. BUT using a picture that misleads people to think you look like someone that you are not is wrong.
For the record my profile pic is actually of me, just not my face :)2