Ratna,
Fantastic! Not sure why it disappeared there for a bit, but installing again should always be ok to try.. and glad it worked.
I'm happy to hear things are on a roll now, but if you have any questions, feedback, or issues, 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