Logout from facebook after registration

Found out how to do this, I put following code on my ‘Thanks for registration page’:

<script type="text/javascript">
        jQuery(document).ready(function($) {
            $.ajaxSetup({ cache: true });
            $.getScript('//connect.facebook.net/en_UK/all.js', function(){
                FB.init({
                    appId: '123456'
                });
                FB.getLoginStatus(function(response) {
                    if (response && response.status === 'connected') {
                        FB.logout(function(response) {
                        });
                    }
                });
            });

            setTimeout(function() {
                location.href = "<?php echo get_site_url()?>/";
            },4000);
        });

    </script>

Might be nice feature to add to core…