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twttr.events.bind('tweet', function(event) {
  if (event) {
    var targetUrl;
    if (event.target && event.target.nodeName == 'IFRAME') {
      targetUrl = extractParamFromUri(event.target.src, 'url');
    }
    _gaq.push(['_trackSocial', 'twitter', 'tweet', targetUrl]);
  }
);