Please go to the Configuration -> Facebook API tab of JFConnect and set "Show Facebook API Errors on Front-End" to "Yes". Then, go to the page you were testing. Wait 30 seconds or so (just in case) and see if any popup with any message appears. Let me know what that message is, if any.
I was testing on "index.php/webcams.html", which, if I go there now, I see the proper Javascript to trigger the action. With the Front-End messages disabled, though, I can't see the same message I saw and posted above.
Thanks,
Alex