What does "enemy" or "friend" status change?

Chairman, that is one of the most disturbing profile pics ever! I have no problem with the pic, it just creeps me out. Good Job!

This option allows you to define a friends list. Friends are always allowed to send you private messages and they will be available in the quick list of players when creating a new private game.
From: http://www.wargear.net/settings/friends

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This option allows you to define an enemies list. Your enemies cannot post on your profile wall and you can use your preferences to set whether they can send you Private Messages. Also enemies with standard accounts cannot join games that you have started or have already joined.
From: http://www.wargear.net/settings/enemies