You're correct. Right now, we always include that library, even if Facebook functionality isn't used on the page. We mainly do that because most sites have a Like button, Login button or something else on every page that needs it. I've added it to our to-do list to be more wise about when to and when not to load that library.
If you want to remove that Javascript right now, please edit the /components/com_jfbconnect/libraries/provider/facebook.php file. Around line 299, you'll see:
public function onAfterRender()
{
Add the "return;" after that line to disable that whole function from running, like:
public function onAfterRender()
{
return;
I hope that helps,
Alex