Can you provide us with your Facebook access at http://stackideas.com/dashboard/site so we can check on this?

OK, I already updated FB details.

Hey there,

I've checked in your Facebook app configuration, i noticed you have added this domain URL (http://yoursite.com) in this section `Valid OAuth redirect URIs`, by right you do not need to add this domain is because your site already support SSL (https).

After I remove that domain name and try register via Facebook in your site, it seems work fine, you can check my video here : http://screencast.com/t/8wiz2qIGuIr

Can you give it a check now?

Note : Make sure you have register via Facebook using this domain name with www prefix e.g. https://www.yoursite.com

Hi there,

After I check it, if login in the first time, that can. But after logout and login again, still appear error. May be effect from cache system?

Hi there,

After I disable 'System - Page Cache' plugin, login site back to normal. I would like to consult you, how to enable this plugin and login work fine.

Hi there,

This issues is caused by Joomla's plugin. I would suggest you to consult with Joomla plugin's service provider regarding this issues. Thanks for understanding.