Can not use the Facebook button

There's quite a few possible causes of what you mention. However, I can't test because your site seems to be going into a loop when I visit the home page now. The home page redirects to:
/index.php/component/users/?view=login&Itemid=387
And then Chrome shows an error about continuous redirects.

Getting that cleared up could help the problem, but will definitely help us investigate further.

Until then, the best suggestions I can give are:
* Double check that Autotune says everything is setup properly in the Error Check, Site Check and FB App settings
* Set the "Include jQuery / Bootstrap" setting to 'Yes' in JFBConnect
* Change the "Show 'login credentials' in popup" setting to 'No'. This eliminates some conflicts with other extensions that include their own Facebook integration.

I hope that helps, but if you still have issues, let us know when the home page loads and we'll gladly help investigate further.

Thanks,
Alex

Your site is loading for me now, which is definitely an improvement. On the JomSocial page when I try to login, I do get the Facebook popup to login, but I get the following error message:

We could not log you in: You can't log in to this app or website because you do not meet the requirements for country, age or other criteria.

It seems like it works though, which is good.

On the EasySocial page, there are the Javascript errors you mention. It looks like you have some sort of optimization extension that's trying to shove all the Javascript to the bottom of the page. That's causing issues because some code expects and needs that Javascript at the top. I can't be sure this is the cause, but I'd highly recommend disabling any optimization stuff you have enabled. One other error I see is:

primees:3855 GET https://YOURSITE/plugins/system/toomanyfiles/js/jquery-1.12.4.min.js

I don't know what toomanyfiles is, but it seems to be broken and, if that's what's optimizing your Javascript, it's probably causing more issues than just that error above.

Thanks,
Alex

Awesome! I'm glad to hear we could help. If you run into anything else or need further assistance, just let us know.

Finally, if you haven't already, please consider leaving a rating or review on the Joomla Extension Directory for JFBConnect. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/extensi...-display/jfbconnect/

Thanks,
Alex