Sorry for the delay in answering.
You can easily add Open Graph tags to any extension/content by inserting our SCOpenGraph tags into the content such as
[code]{SCOpenGraph image=FULL_URL/TO/IMAGE.png} {SCOpenGraph description=Yoo Zoo is great}[/url]
This is easy and doesn't require much knowledge except where to put our easy-tags in the Yoo Zoo code.
If you want the open graph tags contained in one plugin, it's relatively straightforward to create a plugin in our Open Graph plugins group. You can use an existing one of our plugins as a guideline, such as our plugins/opengraph/easysocial directory. I can add an issue in our tracker for putting this in JFBConnect as a feature request, but don't have a timeframe on if/when we'd get that in.
-Melissa