If you are having trouble with setSize() and setAutoGrow() not working correctly, first make sure to check the latest Javascript SDK page. The way Facebook wants you to import its SDK is frequently updated and changed without notice.
https://developers.facebook.com/docs/reference/javascript/
You can see the latest methodology working with setSize() in the proper place below.
<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
xfbml : true // parse XFBML
});
FB.Canvas.setSize({height:900});
};
// Load the SDK Asynchronously
(function(d){
var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
ref.parentNode.insertBefore(js, ref);
}(document));
</script>


