We had our first report about that exact plugin about 2 days ago. We're working on an update to Autotune to check if browser caching is enabled and report a warning if so.
Glad that got you going though, and if you run into anything else, just let us know!
Finally, if you haven't already, please consider leaving a rating and review on the Joomla Extension Directory for JFBConnect, or our support. It's certainly not required, but very appreciated!
extensions.joomla.org/extensions/social-...ook-integration/7215
Thanks,
Alex