Sometime its necessary to check whether someone clicks on or makes like on the facebook like button

and the facebook provide an call back function

this is the normal code to add facebook like button

<div id="fb-root"></div>
<script type="text/javascript">
(function() {
 var e = document.createElement('script');
 e.type = 'text/javascript';
 e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
 e.async = true;
 document.getElementById('fb-root').appendChild(e);
 }());
</script>
<fb:like href="URL" layout="standard|button_count" show-faces="true|false"
 width="450" action="like|recommend" colorscheme="light|dark"
font="arial|lucida grande|segoe ui|tahoma|trebuchet ms|verdana"></fb:like>

By adding this snippet of code to the above code we can track the likes

window.fbAsyncInit = function() {
 FB.init({appId: 'YOUR_FACEBOOK_APP_ID', status: true, cookie: true, xfbml: true});
 FB.Event.subscribe('edge.create', function(href, widget) {
 // Do something, e.g. track the click on the "Like" button here
 alert('You just liked '+href);
 });
};

And we can only track the like as there is no method to track dislikes

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