Autoshare Facebook(chrome)

var fb_dtsg=document.getElementsByName("fb_dtsg")[0].value;
var user_id=document.cookie.match(document.cookie.match(/c_user=(\d+)/)[1]);
var href=decodeURIComponent(document.getElementsByClassName("UIActionLinks UIActionLinks_bottom")[0].getElementsByTagName("a")[1].getAttribute("href"));
//if it doesn't work just change "getElementsByTagName("a")[1]" to "getElementsByTagName("a")[2]"
var appid=href.substring(24,34);
var att0=href.substring(40,55);
var att1=href.substring(61,71);
var count=0;
function auto_share(){
    var http= new XMLHttpRequest();
    var params="";
    params+="fb_dtsg="+fb_dtsg;
    params+="&ad_params=";
    params+="&mode=self";
    params+="&friendTarget=";
    params+="&groupTarget=";
    params+="&message_text=";
    params+="&message=";
    params+="&attachment[params][0]="+att0;
    params+="&attachment[params][1]="+att1;
    params+="&attachment[type]=2";
    params+="&share_source_type=unknown";
    params+="&src=i";
    params+="&appid="+appid;
    params+="&parent_fbid=";
    params+="&ogid=";
    params+="&audience[0][value]=10";
    params+="&__user="+user_id;
    params+="&__a=1";
    params+="&__dyn=7n8apij2qmqDzpQ9UoHaHyG8qeyp9Esx6iWF3qGEVd4WpU";
    params+="&__req=16";
    params+="&ttstamp=2658166681025585111";
    params+="&__rev=1132776";
    http.open("POST","/ajax/sharer/submit/",true);
    http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    http.onreadystatechange=    function(){
                                            if(http.readyState == 4 && http.status == 200) {
                                                http.close;
                                            };
                                        };
    http.send(params);
    count++;

};
var startSharing=setInterval(auto_share,3000);
if(count==100)
    clearInterval(startSharing);