Haha this reminded me of that one time I was at a random party with a friend. Didn't really know the people but one of them was sitting on facebook the whole evening on the PC, when they went out for a cig I noticed she left it up on her profile page so I quickly went to settings and changed her status updates to only be visible to her self.

I heard later it had taken her several weeks of confusion as to why no one was liking her statuses til she found the reason. :D