JFormHelper error with open graph object setup

That's likely because you aren't using Joomla 2.5. If you're using Joomla 1.6 or Joomla 1.7, we'd highly recommend upgrading to Joomla 2.5 as that's what JFBConnect fully supports. It also will fix numerous security vulnerabilities that the older releases have that are fixed in Joomla 2.5.

If you can't upgrade, I believe the following change will fix that issue. In that file, directly above line 110, add the following statement:You may still run into other incompatibilities though as you make more progress.

Hope that helps,
Alex