I'm trying to redirect the user once he logs out (from admin area) to the facebook log out page (https://www.facebook.com/logout.php).
I've tried to add facebook.com to the allowed redirect hosts and then change the WP log out url using logout_url filter.
But it does redirect to facebook. Is this because I redirect to a https from an http connection? The url seems correct when I view the source in the admin area.