Parse.initialize("7YyZO6oZNVongKR6pluyULEkMEmvLVRtVZvd6OXn", "JTOrsTnWqTBhxqxFMEvPdOUzDd9Ro01JqpiAF003");
      window.fbAsyncInit = function() {
    Parse.FacebookUtils.init({ // this line replaces FB.init({
      appId      : '971388552927772', // Facebook App ID
      status     : true,  // check Facebook Login status
      cookie     : true,  // enable cookies to allow Parse to access the session
      xfbml      : true,  // initialize Facebook social plugins on the page
      version    : 'v2.3' // point to the latest Facebook Graph API version
    });

        // Run code after the Facebook SDK is loaded
  };

function checkLoginState() {
      Parse.FacebookUtils.logIn(null, {
            success: function(user) {
                  if (!user.existed()) {
                        alert("User signed up and logged in through Facebook!");
                  } else {
                        alert("User logged in through Facebook!");
                  }
            },
            error: function(user, error) {
                  alert("User cancelled the Facebook login or did not fully authorize.");
            }
      });
}


      (function(d, s, id){
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) {return;}
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

Parse.initialize("7YyZO6oZNVongKR6pluyULEkMEmvLVRtVZvd6OXn", "JTOrsTnWqTBhxqxFMEvPdOUzDd9Ro01JqpiAF003");
      window.fbAsyncInit = function() {
    Parse.FacebookUtils.init({ // this line replaces FB.init({
      appId      : '971388552927772', // Facebook App ID
      status     : true,  // check Facebook Login status
      cookie     : true,  // enable cookies to allow Parse to access the session
      xfbml      : true,  // initialize Facebook social plugins on the page
      version    : 'v2.3' // point to the latest Facebook Graph API version
    });

        // Run code after the Facebook SDK is loaded
  };

function checkLoginState() {
      if (typeof FB !== 'undefined') {
            Parse.FacebookUtils.logIn(null, {
                  success: function(user) {
                        if (!user.existed()) {
                              alert("User signed up and logged in through Facebook!");
                        } else {
                              alert("User logged in through Facebook!");
                        }
                  },
                  error: function(user, error) {
                        alert("Please login to access the Locaholic services!!");
                  }
            });
      }
      else{
            alert("Your network does not support FaceBook Login!!")
      }
}


      (function(d, s, id){
    var js, fjs = d.getElementsByTagName(s)[0];
    if (d.getElementById(id)) {return;}
    js = d.createElement(s); js.id = id;
    js.src = "//connect.facebook.net/en_US/sdk.js";
    fjs.parentNode.insertBefore(js, fjs);
  }(document, 'script', 'facebook-jssdk'));

Update main.js