Michael,
We're actually working on new Open Graph plugins right now, including one for Zoo. That should set the basic Open Graph tags and also allow you to create some Open Graph Actions to automatically post to a user's wall when they interact with your Zoo content. That plugin should be out later this month.
There is no setting to disable Open Graph tags. We actually used to have one in older versions, but we removed it about a year ago. You're the first to ask how to disable the feature. To do so, we could help you with a line or 2 of code that would prevent our Open Graph Tag features from working. However, we'd need to know what version of JFBConnect you're using. Let us know that, and I can get you the code.
Also, please post from the account you subscribed to JFBConnect from. Priority support is for active subscribers only.
Thanks,
Alex