Facebook API FB.getLoginStatus returns undefined

I have added a like button on my website, and want to know who clicked the like button. These are my sample code:

    <div id="fb-root"></div>
    <script>
      window.fbAsyncInit = function() {
        FB.init({appId: '182722795115444', status: true, cookie: true,
                 xfbml: true});

        // To find who clicked the like button
        FB.Event.subscribe('edge.create', function(response){
            FB.getLoginStatus(function(response) {

                if (response.session) {
                    // l开发者_StackOverflow中文版ogged in and connected user, someone you know
                    alert("logged in and connected user");
                } else {
                    // no user session available, someone you dont know
                    alert("no user session available");
                }
            });
        });
      };
      (function() {
        var e = document.createElement('script'); e.async = true;
        e.src = document.location.protocol +
          '//connect.facebook.net/en_US/all.js';
        document.getElementById('fb-root').appendChild(e);
      }());
    </script>
    <script src="http://connect.facebook.net/en_US/all.js#appId=182722795115444&amp;xfbml=1"></script>
    <fb:like href="www.blogcountry.net" send="true" width="450" show_faces="true" font=""></fb:like>

When I clicked the Like button, and login facebook, do like successfully, but got "no user session available" alert.

So I am confused:

1. My appId in FB.init is the same as fb:like tag, is it right?
2. Are there something wrong in my program ?
3. How to get user name who click the Like button?

Thanks in advance.

Update:

@OffBySome Thanks for your answer.

You means I must call FB authenticate API, then I could get the user's info? But...in facebook development doc FAQ:

How do I know when a user clicks a Like button?

If you are using the XFBML version of the button, you can subscribe to the 'edge.create' event through FB.Event.subscribe.

So, It means I cannot know who clicks the Like Button, just know the button is clicked.

If I want to get user's info, I must implement the login action before click Like? It's really bad userbility.

Could anyone give a good idea to resolve it...

I am pretty sure you won't get a Facebook session just by liking a page. You normally only get a user Facebook session when they authenticate with your application (for example, with <fb:login-button autologoutlink="true"></fb:login-button>) . If do an an alert(JSON.stringify(response)); inside that function what values do you get?

Try this..

FB.Event.subscribe('edge.create', function(href, widget) 
{                   
alert('You just liked '+href);  

    session = FB.getSession();
    uid = session['uid'];
    alert(uid);

});