I have tried in the post but I found no solution.
I installed sfc but can not login with facebook.
I see the button in the sidebar is that in the comment box.
When I click "Connect with Facebook" open the pop-up on facebook where I enter username and password, then the window closes and the page of the site makes no refresh.
The site (besport.org/sport) has a number of subdomains or type tennis.besport.org golf.besport.org with a htaccess rule that refers to "sport".besport.org/sports/index.php.
I set in the application of facebook:
site url: http://besport.org/sport/
site domain: besport.org
The site can be tested with this post
Thank you in advance for the help.