regarding the hidden back link mentioned above, it doesn´r happen anymore, at least on the last version.
I´m facing a problem in version 1.7. It shows the static description (if you choose it in administration) but not the article description. It is not capturing the article description. That configuration "Use statice description ()yes ()no" is not working propoerly as far as I can see.
Besides this problem, this is one of the most complete plugins to opengraph protocol and you put that back link if you want only.