Three good things to know about and to consider regarding member privacy on the forum are as follows:
Private Messages - Private messages can be sent to others and you can do so by clicking on a member's screen name and selecting "message" button on the screen. Only you and the individual you are communicating with can see this communication.
Member Bulletin Board - When you type inside the box shown in the photo it becomes "public information" that all others can see, either by clicking on your screen name or selecting the "activity" menu option at the top of the forum screen.
Activity - Comments posted on the member bulletin board become "public information" and can be seen by anyone who clicks on the activity menu.