Invite friends popup is struggling, if the user is not logged in
FB.ui({
                    appId:  '"' + appId + '"',
                    method: 'apprequests',
                    display: 'iframe',
                    message: '"' + message + '"',
                    title: 'Send your friends an application request'
                },
                function (response) {
                    if (response && response.request_ids) {
                        FB.api(response.request_ids, 'delete');
                    }
                });

<script>
document.getElementById('send-to-many').onclick = function() {
  FB.ui({
    method: 'apprequests',
    message: 'Visit my page'
  }, Log.info.bind('send-to-many callback'));
}
</script>