I've tried in both Chrome and Firefox, both logged in through my Facebook account and not, and can't seem to see that error.
Can you try clearing caches in Joomla and in your browser and trying again? Also, if you have other Facebook user's you can try with, or get in contact with, please see if they're seeing it.
From what you say, it sounds like it's caused by/related to the JFBCInvite module. If you disable that module, does the error go away? That will help us narrow down where to look.
Thanks,
Alex