Facebook JavaScript SDK

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ASP.NET

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Hi all,
I have a simple question as it seems that I'm missing something obvious. Facebook Javascript SDK requires an initial load, before you can actually use the methods within it. It is recommended to load it asynchronously:

<div id="fb-root"></div>
<script>
  window.fbAsyncInit = function() {
    FB.init({
      appId      : 'YOUR_APP_ID', // App ID
      channelUrl : '//WWW.YOUR_DOMAIN.COM/channel.html', // Channel File
      status     : true, // check login status
      cookie     : true, // enable cookies to allow the server to access the session
      oauth      : true, // enable OAuth 2.0
      xfbml      : true  // parse XFBML
    });

    // Additional initialization code here
  };

  // Load the SDK Asynchronously
  (function(d){
     var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
     js = d.createElement('script'); js.id = id; js.async = true;
     js.src = "//connect.facebook.net/en_US/all.js";
     d.getElementsByTagName('head')[0].appendChild(js);
   }(document));
</script>

The question is, do I need to call

FB.init()

on each page that uses the SDK, or it is enough to call 'init' once and include

<script src="//connect.facebook.net/en_US/all.js"></script>

script tag on other web pages. Thanks in advance.