title: facebook JavaScript SDK - what is the 'your app id' when you just want to use the SDK for the facebook 'Like' button?
body: <p>I want to add the facebook 'Like' button to my website, but the JavaScript API is asking for <strong>'your app id'</strong></p>
  
  <pre><code>&lt;div id="fb-root"&gt;&lt;/div&gt;
  &lt;script&gt;
    window.fbAsyncInit = function() {
      FB.init({appId: 'your app id', status: true, cookie: true,
               xfbml: true});
    };
    (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);
    }());
  &lt;/script&gt;
  </code></pre>
  
  <p>What should I put there?</p>
  
  <p>I could use the iframe code they give, but would prefer to use the XFBML as it will allow me to add more features in the future.</p>
  
  <p>Thanks.</p>