Open Graph encompasses a few things:
Open Graph Tags - These are used to describe each page of your site to Facebook. They are used whenever that page is shared within Facebook, whether a user shares the link, Likes your page, leaves a comment, etc.
Open Graph Actions - These are activities that you create on your site that can post to a user's Timeline. Some things can be created to post to their Timeline automatically, like "Uploading a photo", "Joining a Group" or "Left a review". Others can be done manually by the user by clicking a button you place in your content "I cooked this recipe"
For more information see our Open Graph overview:
www.sourcecoast.com/jfbconnect/docs/open-graph/
I hope that helps get you going, but if you have any questions, just let us know!
Thanks,
Alex