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facebook.js

(function($) {
  console.log("facebook loading...");
    var j;
    // check facebook available
    if($('#fb-root').length === 0) {
    // not found fb-root prepend element to body
        $('body').prepend("<div id='fb-root'></div>");
        // and load javascript for facebook 
        j = document.createElement('script');
        j.type = 'text/javascript';
        j.src = '//connect.facebook.net/en_US/all.js';
        $('#fb-root').append(j);
    }

    $(document).ready(function() {
        window.fbAsyncInit = function() {     
            FB.init({
                appId      : 'YOUR APP ID', // App ID
                status     : true, // check login status
                cookie     : true, // enable cookies to allow the server to access the session
                xfbml      : true,  // parse XFBML
                frictionlessRequests: true // Allow frictionless request
            });
            window.fbAsyncInitCalled = true;
        };
    });  
})(window.jQuery);

index.html

<script type="text/javascript" src="js/facebook.js"></script>
<script type="text/javascript" src="js/script.js"></script>

script.js

var fbAsyncInitCallback = setInterval(function() {
        if(window.fbAsyncInitCalled) {
            console.log('FB already loaded');

            // test 
            FB.api('/me', function(resp) {
                console.log(resp);
            })

            // subscribe to event 
            FB.getLoginStatus(function(response) {
                if (response.status === 'connected') {
                    // the user is logged in and has authenticated your
                    // app, and response.authResponse supplies
                    // the user's ID, a valid access token, a signed
                    // request, and the time the access token 
                    // and signed request each expire
                    // var uid = response.authResponse.userID;
                    // var accessToken = response.authResponse.accessToken;
                    console.log(">> facebook connect >> here is xss fb");
                  
                } 
                else if (response.status === 'not_authorized') {
                    // the user is logged in to Facebook, 
                    // but has not authenticated your app
                    console.log("the user is logged in to Facebook, but has not authenticated your app");
                } 
                else {
                    // the user isn't logged in to Facebook.
                    console.log("the user isn't logged in to Facebook.");
                }
            });            

            // Comment detect
            FB.Event.subscribe('comment.create', function(response) {
                console.log(response);
            });

            // Like Detect
            FB.Event.subscribe('edge.create', function(response) {
                console.log(response);
            });

            clearInterval(fbAsyncInitCallback);
        }
        else {
            console.log('+');
        }
    }, 2000);