This .js file will render HTML5 social buttons asynchronously as well as bind callbacks to Google Analytics. Supports Facebook and Twitter interaction tracking and Facebook Comment tracking.

Asynchronous Facebook Twitter Google buttons and Google Analytics Social Tracking

// Facebook Social Tracking
window.fbAsyncInit = function() {
      FB.init({
        appId      : '123456789', // ENTER your FB App ID
        channelUrl : 'WWW.YOUR_DOMAIN.COM', // Channel File
        status     : true, // check login status
        cookie     : true, // enable cookies to allow the server to access the session
        xfbml      : true  // parse XFBML
      });

      _ga.trackFacebook(); //Google Analytics tracking

    };

    // Load the Facebook SDK Asynchronously
    (function(d){
      var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
      if (d.getElementById(id)) {return;}
      js = d.createElement('script'); js.id = id; js.async = true;
      js.src = "//connect.facebook.net/en_US/all.js";
      ref.parentNode.insertBefore(js, ref);
    }(document));
    
// Twitter Social Tracking
window.twttr = (function (d,s,id) {
      var t, js, fjs = d.getElementsByTagName(s)[0];
      if (d.getElementById(id)) return; js=d.createElement(s); js.id=id;
      js.src="//platform.twitter.com/widgets.js"; fjs.parentNode.insertBefore(js, fjs);
      return window.twttr || (t = { _e: [], ready: function(f){ t._e.push(f) } });
    }(document, "script", "twitter-wjs"));

    // Wait for the asynchronous resources to load
    twttr.ready(function(twttr) {
        _ga.trackTwitter(); //Google Analytics tracking
    });

// Google Plus Tracking
window.___gcfg = {
        lang: 'en-US'
      };

      (function() {
        var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
        po.src = 'https://apis.google.com/js/plusone.js';
        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
      })();

// Copyright 2012 Google Inc. All Rights Reserved.

/**
 * @fileoverview A simple script to automatically track Facebook and Twitter
 * buttons using Google Analytics social tracking feature.
 * @author api.nickm@gmail.com (Nick Mihailovski)
 * @author api.petef@gmail.com (Pete Frisella)
 */


/**
 * Namespace.
 * @type {Object}.
 */
var _ga = _ga || {};


/**
 * Ensure global _gaq Google Analytics queue has been initialized.
 * @type {Array}
 */
var _gaq = _gaq || [];


/**
 * Tracks social interactions by iterating through each tracker object
 * of the page, and calling the _trackSocial method. This function
 * should be pushed onto the _gaq queue. For details on parameters see
 * http://code.google.com/apis/analytics/docs/gaJS/gaJSApiSocialTracking.html
 * @param {string} network The network on which the action occurs.
 * @param {string} socialAction The type of action that happens.
 * @param {string} opt_target Optional text value that indicates the
 *     subject of the action.
 * @param {string} opt_pagePath Optional page (by path, not full URL)
 *     from which the action occurred.
 * @return a function that iterates over each tracker object
 *    and calls the _trackSocial method.
 * @private
 */
_ga.getSocialActionTrackers_ = function(
    network, socialAction, opt_target, opt_pagePath) {
  return function() {
    var trackers = _gat._getTrackers();
    for (var i = 0, tracker; tracker = trackers[i]; i++) {
      tracker._trackSocial(network, socialAction, opt_target, opt_pagePath);
    }
  };
};


/**
 * Tracks Facebook likes, unlikes and sends by suscribing to the Facebook
 * JSAPI event model. Note: This will not track facebook buttons using the
 * iframe method.
 * @param {string} opt_pagePath An optional URL to associate the social
 *     tracking with a particular page.
 */
_ga.trackFacebook = function(opt_pagePath) {
  try {
    if (FB && FB.Event && FB.Event.subscribe) {
      FB.Event.subscribe('edge.create', function(opt_target) {
        _gaq.push(_ga.getSocialActionTrackers_('facebook', 'like',
            opt_target, opt_pagePath));
      });
      FB.Event.subscribe('edge.remove', function(opt_target) {
        _gaq.push(_ga.getSocialActionTrackers_('facebook', 'unlike',
            opt_target, opt_pagePath));
      });
      FB.Event.subscribe('message.send', function(opt_target) {
        _gaq.push(_ga.getSocialActionTrackers_('facebook', 'send',
            opt_target, opt_pagePath));
      });
      FB.Event.subscribe('comment.create', function(opt_target) {
        _gaq.push(_ga.getSocialActionTrackers_('facebook', 'comment',
            opt_target.href, opt_pagePath));
      });
      FB.Event.subscribe('comment.remove', function(opt_target) {
        _gaq.push(_ga.getSocialActionTrackers_('facebook', 'uncomment',
            opt_target.href, opt_pagePath));
      });
    }
  } catch (e) {}
};


/**
 * Handles tracking for Twitter click and tweet Intent Events which occur
 * everytime a user Tweets using a Tweet Button, clicks a Tweet Button, or
 * clicks a Tweet Count. This method should be binded to Twitter click and
 * tweet events and used as a callback function.
 * Details here: http://dev.twitter.com/docs/intents/events
 * @param {object} intent_event An object representing the Twitter Intent Event
 *     passed from the Tweet Button.
 * @param {string} opt_pagePath An optional URL to associate the social
 *     tracking with a particular page.
 * @private
 */
_ga.trackTwitterHandler_ = function(intent_event, opt_pagePath) {
  var opt_target; //Default value is undefined
  if (intent_event && intent_event.type == 'tweet' ||
          intent_event.type == 'click' || intent_event.type == 'follow') {
    if (intent_event.target.nodeName == 'IFRAME') {
      opt_target = _ga.extractParamFromUri_(intent_event.target.src, 'url');
    }
    var socialAction = intent_event.type + ((intent_event.type == 'click') ?
        '-' + intent_event.region : ''); //append the type of click to action
    _gaq.push(_ga.getSocialActionTrackers_('twitter', socialAction, opt_target,
        opt_pagePath));
  }
};

/**
 * Binds Twitter Intent Events to a callback function that will handle
 * the social tracking for Google Analytics. This function should be called
 * once the Twitter widget.js file is loaded and ready.
 * @param {string} opt_pagePath An optional URL to associate the social
 *     tracking with a particular page.
 */
_ga.trackTwitter = function(opt_pagePath) {
  intent_handler = function(intent_event) {
    _ga.trackTwitterHandler_(intent_event, opt_pagePath);
  };

  //bind twitter Click and Tweet events to Twitter tracking handler
  twttr.events.bind('click', intent_handler);
  twttr.events.bind('tweet', intent_handler);
  twttr.events.bind('follow', intent_handler);
};


/**
 * Extracts a query parameter value from a URI.
 * @param {string} uri The URI from which to extract the parameter.
 * @param {string} paramName The name of the query paramater to extract.
 * @return {string} The un-encoded value of the query paramater. undefined
 *     if there is no URI parameter.
 * @private
 */
_ga.extractParamFromUri_ = function(uri, paramName) {
  if (!uri) {
    return;
  }
  var regex = new RegExp('[\\?&#]' + paramName + '=([^&#]*)');
  var params = regex.exec(uri);
  if (params != null) {
    return unescape(params[1]);
  }
  return;
};

perhaps use decodeURI instead of unescape