My website cannot render the page

Could you turn on Error Reporting on your site and let us know what the error is? The setting is in your backend > Global Configuration > Server. Set the value to maximum or development.

Thanks
-Melissa

My suggestion is to
1) re-enable the JFBCSystem plugin
2) disable any Open Graph plugins and reload the page to see if it loads correctly
3) If still blank, disable any Social Profiles plugins and reload the page to see if it loads correctly
4) If still blank, disable the JFBCSystem plugin.

It sounds like host or another extension has disabled error reporting, even though it's turned on in the backend. If the above steps don't give any progress, then you'll need to get access to your server error logs to help narrow down the problem.

-Melissa