FB.Event.subscribe('edge.create', function(targetUrl) {
  _gaq.push(['_trackSocial', 'facebook', 'like', targetUrl]);
});
FB.Event.subscribe('edge.remove', function(targetUrl) {
  _gaq.push(['_trackSocial', 'facebook', 'unlike', targetUrl]);
});
FB.Event.subscribe('message.send', function(targetUrl) {
  _gaq.push(['_trackSocial', 'facebook', 'send', targetUrl]);
});