We already have an issue in our feature tracker to let a user set an Open Graph default in our configuration, like:
When set that way (with no value on the right), the tag will not be inserted on the page at all.
That will be in the next major release, v6.3. Until then, the code change I've provided in other threads should be used.
Also, please remember that the subscription you're using right now was extended by us for free due to your feedback in the past. While you can choose to leave whatever review of JFBConnect you'd like, please note that we will cancel your current subscription that we extended for you as a courtesy in response.
Thanks,
Alex