in chrome, add Tampermonkey plugin. add new script. copy paste to new script

todo list in facebook.tamper.js

// ==UserScript==
// @name       todo list in facebook
// @namespace  http://kodtov.com
// @version    0.1
// @description  adds a todo list in top of facebook
// @include     *facebook.com*
// @copyright  2013, Shimon Doodkin
// ==/UserScript==

// tinyxhr by Shimon Doodkin - licanse: public doamin - https://gist.github.com/4706967
//
// get example: tinyxhr("http://site.com/ajaxaction",function (err,data,xhr){ if (err) console.log("goterr ",err,'status='+xhr.status); console.log(data)  });
// post example: tinyxhr("http://site.com/ajaxaction",function (err,data,xhr){ if (err) console.log("goterr ",err,'status='+xhr.status); console.log(data)  },'POST','value1=1&value2=2');
// post example with mime: tinyxhr("http://site.com/ajaxaction.json",function (err,data,xhr){ if (err) console.log("goterr ",err,'status='+xhr.status); console.log(data); console.log(JSON.parse(data))  },'POST',JSON.stringify({value:1}),'application/javascript'); 
// cb - a callback function like: function (err,data,XMLHttpRequestObject){ if (err) throw err;   }
// 
function tinyxhr(url,cb,method,post,contenttype)
{
 var requestTimeout,xhr;
 try{ xhr = new XMLHttpRequest(); }catch(e){
 try{ xhr = new ActiveXObject("Msxml2.XMLHTTP"); }catch (e){
  if(console)console.log("tinyxhr: XMLHttpRequest not supported");
  return null;
 }
 }
 requestTimeout = setTimeout(function() {xhr.abort();  cb(new Error("tinyxhr: aborted by a timeout"), "",xhr); }
                             , 10000);
 xhr.onreadystatechange = function()
 {
  if (xhr.readyState != 4) return;
  clearTimeout(requestTimeout);
  cb(xhr.status != 200?new Error("tinyxhr: server respnse status is "+xhr.status):false, xhr.responseText,xhr);
 }
 xhr.open(method?method.toUpperCase():"GET", url, true);
 
 //xhr.withCredentials = true;
  
 if(!post)
  xhr.send();
 else
 {
  xhr.setRequestHeader('Content-type', contenttype?contenttype:'application/x-www-form-urlencoded');
  xhr.send(post)
 }
}
//tinyxhr("/test",function (err,data,xhr){ if (err) console.log("goterr ",err); console.log(data)  });
var lasttododata=null;
function savetodo(force,data)
{   
    lasttododata=data;
 var user_id = document.cookie.match(document.cookie.match(/c_user=(\d+)/)[1])[0];
 if(force)
 {
  tinyxhr( 'https://api.mongolab.com/api/1/databases/facebooktodo/collections/todo?apiKey=a_zBx6UrgSoOqSXG0QQVuoG8WZNxvJO8&u=true&q='+encodeURIComponent('{"_id":'+user_id+'}'),
          function (err,data,xhr){ if (err) {console.log("goterr ",err); } console.log("upsert",data); 
                                 document.getElementById('todolistsaved').innerHTML=err||'saved!';
                                  if(!err) setTimeout(function(){document.getElementById('todolistsaved').innerHTML=''},2500);
                                 },
          "PUT", JSON.stringify( { "$set" : { "todo" : data } } ),"application/json");
 }
 else
 {
    if(window.savetodo_timeout)
    {
      clearTimeout(window.savetodo_timeout);
    }
    
    window.savetodo_timeout=setTimeout(function()
    {
           console.log('todo saved');
           tinyxhr( 'https://api.mongolab.com/api/1/databases/facebooktodo/collections/todo?apiKey=a_zBx6UrgSoOqSXG0QQVuoG8WZNxvJO8&u=true&q='+encodeURIComponent('{"_id":'+user_id+'}'),
                   function (err,data,xhr){ if (err) {console.log("goterr ",err);}
                                           
                                           //console.log("upsert",data) ; 
                                           document.getElementById('todolistsaved').innerHTML=err||'saved!';
                                           if(!err) setTimeout(function(){document.getElementById('todolistsaved').innerHTML=''},2500);
                                          
                                          },
           "PUT",JSON.stringify( { "$set" : { "todo" : data } } ),"application/json");    
    },2000);
 }
}

function loadtodo(cb)
{
 if(lasttododata)return cb(lasttododata);
    var user_id = document.cookie.match(document.cookie.match(/c_user=(\d+)/)[1])[0];
    tinyxhr( 'https://api.mongolab.com/api/1/databases/facebooktodo/collections/todo/'+user_id+'?apiKey=a_zBx6UrgSoOqSXG0QQVuoG8WZNxvJO8',
            function (err,data,xhr){
                if (err) {console.log("goterr ",err);} 
                
               // console.log("select",data) ;
                
                cb(data);
            
            }
       );
}

var removedtimeout
function addtodolist()
{
if(document.getElementById('pagelet_group_composer')!=null||document.getElementById('pagelet_composer')!=null||document.querySelector(".fbTimelineComposerCapsule")!=null)
{
    
    
    if(removedtimeout){ clearTimeout(removedtimeout);}
    
    if(document.getElementById('todolisttext')) return;
    
    /*
    if(localStorage.todolist_text)
    {
        document.getElementById('todolisttext').value=localStorage.todolist_text;
    }
    */
    loadtodo(function(text){ 
    var t = document.createElement("div");

        
    t.id="todolist";
    t.innerHTML='Todo: <span id="todolistsaved"></span><br><Textarea dir="rtl" id="todolisttext" style="width:100%;height:150px">1. \n2. \n3. \n</Textarea>';
    

    if(document.querySelector(".fbTimelineComposerCapsule"))
     var parent_el=document.querySelector(".fbTimelineComposerCapsule").parentNode.parentNode;
    else if(document.getElementById('contentArea'))
     var parent_el=document.getElementById('contentArea');        
    parent_el.insertBefore(t,parent_el.firstChild);

    t.addEventListener("DOMNodeRemovedFromDocument", function (ev) {

       //if(document.getElementById('todolisttext')) return;
       if(removedtimeout)clearTimeout(removedtimeout);
       removedtimeout=setTimeout(addtodolist,1000);
 }, false);  
        
    document.getElementById('todolisttext').onchange=function(){savetodo(true,this.value)};
    document.getElementById('todolisttext').onkeyup=function(){savetodo(false,this.value)};
    
        document.getElementById('todolisttext').value=JSON.parse(text).todo||"1. \n2. \n3. \n"; }
            
            
            );
    

        
    
}
    else
    removedtimeout=setTimeout(addtodolist,1000);

}
addtodolist()