How do I keep my posts on friend's walls private on facebook?

You can not change the privacy level. You can only change the privacy level of your whole wall, not an individual post. You can use the little arrow in the upper right to delete it... but that's about it.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.