I'm not sure why you got that email either. It may have just been a spam message or attempt to trick you into giving up your credentials. I wouldn't recommend clicking any links in that email, or, if you did, you may want to change your Facebook password.
I'm glad we could help. If you have any other questions, just let us know.
Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215
Thanks,
Alex