Si no me equivoco basta con colocar
Código HTML:
Ver original<div id="fb-root"><fb:comments width="500" xid="comentarios"></fb:comments></div> window.fbAsyncInit = function() {
FB.init({
appId : '------------------',
status : true, // check login status
cookie : true, // enable cookies to allow the server to access the session
xfbml : true // parse XFBML
});
};
(function() {
var e = document.createElement('script');
e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
e.async = true;
document.getElementById('fb-root').appendChild(e);
}());