Probably not. JFBConnect does only support one category because that's how Joomla itself works. I'm not sure how CW Multicategories changes things, but it sounds like they've modified core Joomla code, which makes things very variable on how to get it going.
With that said, if you simply enable the Open Graph - Content plugin without configuring a specific object, the default behavior should be to use the article image and meta description automatically. Other options would be to add the Open Graph Tags you want to use manually to each article, like:
{SCOpenGraph image=http://domain.com/link-to-image.jpg}
{SCOpenGraph description=My great description}Again, JFBConnect should automatically set those values, but you can set them 'better' if you want.
I hope that helps answer your question, but if you need anything else, just let us know.
Thanks,
Alex
SQL error when publishing Open Graph Object (Article)
