Anywhere there are a lot of people present to see and follow the link. Too general of a statement? Well, if, for example, you have a big following on Facebook, or if your followers are willing to Like the link, then Facebook would be an excellent site for your link.
The best site(s) would be those that are similar in content to yours. Their followers would be most likely to follow the link and be interested in your content.
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.