Just thought I would share an experience that might benefit some here. Now I may be late to the party so if I am the only one that did not know this than I apologize for taking up your time.
Last night I had a conversation with someone and the longer we talked and the more intense the conversation became I realized that if you are on these boards (any type of board I suppose) your PM's are not private. They can be read by administration. I am not sure yet what level of the food chain has access to them but I am thinking all the way down to mods. I could be wrong on that because I'm sure if someone was friends with an Admin they could get the information. The more I pondered the situation the more I realized that the Administration would have access to them. It is their board. So it really comes down to a matter of trust that when they label it Private Message that they can be trusted to keep it private. They can't can't be.
Be careful out there. I would say that if you wanted more information on how I know this to be true to "PM" me but then I might as well post it in open forum. If you want to know more you will have to buy me breakfast.