I had a social plugin working that looked nice with 'sexy' buttons etc. All was well until we noticed it was full of errors, using https://developers.facebook.com/tools/debug, including FaceBook not finding the images on our pages when a user went to share a page.
I was using NextGen gallery - and came across this plugin.
Fixed most issues upon install - and with a post in the forum, JS (the author) quickly had all issues resolved.
I upgraded to the Pro version, and I feel it adds features that make any situation work fine.
In future I will install on all sites requiring Open Graph.