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Good Wednesday morning Bob. Since I do not post to Facebook. I did not have an answer. It seems as if you have got two good ones.
Bob Haywood I think you can pick the graphics you want to go along with the post on social media. If you don't select, it picks up the default one - like what you have shared. (I'll need to test this out, though on Facebook - on LinkedIn and G+, this is the case.)
If you post the short URL for that blog post, it should post to Facebook properly. At the top of your blog, click on Short URL. A short link will appear. Copy and paste it into your Facebook status. Another benefit is that you'll be able to see how many clicks you got from Facebook.