You might not have seen this clip before. It illustrates the backgrounds of facebook (according to the clips publisher). Personally I can not verify, whether this is all true or not and it does not really matter. The reason why I put it here is because it helps to wonder, what information one really wants to make available on facebook (and the internet in general).
Watch it and think – takes 4 minutes for the clip and then it is up to you, how long you want/need to think about it. I am sure you occasionally spend more time with less relevant things 