For Privacy.
You may want your preferences to be viewed by only certain people, just your friends and family for instance.
There is a "privacy box" for the preferences. Tick/check that box and that preference can only be viewed when a member enters your Word.
So you can make your profile completely private if you wish.
Want a privacy word that is more "you" or easy to remember?
Change it to a word of your choice from the menu in "My Profile".