Comments+ Facebook outgoing problem

I just installed and set up the comments+ (version 1.6.6 with wordpress 3.9.2 and the theme called divi) followed the manual today.
My comments posted on the facebook wall when I use admin accounts (official use to make facebook app) to comments on my post.
However, if my friends with their own facebook accounts trying to comments on the post with check on the 'Post my comment on the wall', it does not post on their facebook wall.