Aloha,
first of all - very nice Component for Joomla - GZ!
For me there is just one issue: i configured to prompt for email, personal data and for the email adress when a user connects to my site.
Unfortunately the FB Box always prompts for the facebook proxy adress. I know, user can change this, but they wouldn't, they just wanna login fast and directly.
So i run through the FB API Documentation and found the settings for prompting. Since you are using the login button tag, there is a parameter called perms="email":
<fb:login-button v="2" perms="email" onlogin="javascript:fb_login_button_click();">
which prompts for the FB proxy first.
The other way we have done the same is with the Graph/PHP with its done like this:
$loginUrl = $facebook->getLoginUrl(array('req_perms'=>'email','display'=> 'popup'));
Did i miss something or does your module also have this setting to prompt for the real email first?
thx in advance