ga_track_twitter.js

var _ga = _ga || {};
var _gaq = _gaq || [];
_ga.trackSocial = function(opt_pageUrl, opt_trackerName) {
  twttr.ready(function (twttr) {
    _ga.trackTwitter(opt_pageUrl, opt_trackerName);
  });
};
_ga.trackTwitter = function(opt_pageUrl, opt_trackerName) {
  var trackerName = _ga.buildTrackerName_(opt_trackerName);
  try {
    if (twttr && twttr.events && twttr.events.bind) {
	  var twttrFunc = function(event) {
        if (event) {
          var targetUrl; // Default value is undefined.
          if (event.target && event.target.nodeName == 'IFRAME') {
            targetUrl = _ga.extractParamFromUri_(event.target.src, 'url');
          }
          _gaq.push([trackerName + '_trackSocial', 'twitter', event.type,
            targetUrl, opt_pageUrl]);
        }
      };
	  // tweet
      twttr.events.bind('tweet', twttrFunc);
      twttr.events.bind('click', twttrFunc);
      twttr.events.bind('retweet', twttrFunc);
      twttr.events.bind('favorite', twttrFunc);
      twttr.events.bind('follow', twttrFunc);
    }
  } catch (e) {}
};
_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;
};

$(function(){
  _ga.trackSocial();
});