FB track like

  (function() {


    var _gaq = _gaq || [];

    try{

      if(FB && FB.Event && FB.Event.subscribe){

        FB.Event.subscribe('edge.create', function(targetUrl) {
          //console.log('liked!');
          _gaq.push(['_trackSocial', 'facebook', 'like', targetUrl]);
        });

        FB.Event.subscribe('edge.remove', function(targetUrl) {

          _gaq.push(['_trackSocial', 'facebook', 'unlike', targetUrl]);
        });
      }



      }

    }catch (e) {}

	})()