I spent too much time figuring this out.  I’m not a SEO guy, I’m a code guy.  But I also have to handle trouble tickets here and there and everywhere.  One of our clients needed full control over which is shared on Facebook on a page-by-page basis.  Some plugins handle a single image for every page, some are just a pain to deal with.  I tried a few of them but I was not able to get the desired effect.  Then I realized that “WordPress SEO by Yoast” already has it built in.  Who’d a thunk?

Here is a video showing you how to do this: