Hello, Checkout https://twitter.com/WarPictures for old war photos very interesting to look at and spread the word.
Interesting. Just don't publish too many of them, one or two photos per day is enough. I recommend using http://bufferapp.com for scheduling tweets.
You can ask similar Twitter accounts (e.g. https://twitter.com/RealTimeWWII) to promote yours, they may do it without expecting any favour in return.