plus_rulet.user.js

// ==UserScript==
// @name Plusach rulet
// @description Random post goes to top
// @author Tsumugi Kotobuki
// @license MIT
// @version 0.01
// @include https://plus.google.com/*
// ==/UserScript==

 function exchangeElements(element1, element2)
{
    var clonedElement1 = element1.cloneNode(true);
    var clonedElement2 = element2.cloneNode(true);

    element2.parentNode.replaceChild(clonedElement1, element2);
    element1.parentNode.replaceChild(clonedElement2, element1);

    return clonedElement1;
}

(function (window, undefined) { 
    var w;
    if (typeof unsafeWindow != undefined) {
        w = unsafeWindow
    } else {
        w = window;
    }
 
addButton = function() 
{
  myButton = document.createElement("span");
  myButton.setAttribute("class", "d-s Cy");
  myButton.setAttribute("id", "rulet");
  myButton.setAttribute("tabindex", "0");
  myButton.setAttribute("role","button");
  myButton.innerHTML = "Rulet!";

  myButton.onclick = function() 
  { 
   var coll;
   
         if(document.getElementsByClassName('Ypa jw gb am') !== undefined)
         {
  	 coll = document.getElementsByClassName('Ypa jw gb am');
  	 } 
  	 if (document.getElementsByClassName('Ypa jw Ic am') !== undefined)
  	 {
  	  coll = document.getElementsByClassName('Ypa jw Ic am');
  	 }
  	 if(document.getElementsByClassName('Ypa jw Yc am') !== undefined)
  	 {
  	  coll = document.getElementsByClassName('Ypa jw Yc am');
  	 }
   var test = document.getElementsByClassName('Yp yt Xa');
   exchangeElements(test[0], test[Math.floor((Math.random() * test.length) + 1)]);
   
console.log(coll);
  	var coll1 = coll[0].getElementsByClassName('Yp yt Xa');
  	var coll2 = coll[1].getElementsByClassName('Yp yt Xa');
  	var coll3 = coll[2].getElementsByClassName('Yp yt Xa');
  	
  	/*if (coll.length <= 4) 
  	{
 		exchangeElements(test[0], test[Math.floor((Math.random() * test.length) + 1)]);
  	} 
  	else if (coll.length > 4) 
  	{*/
 		
 		exchangeElements(test[coll1.length], test[Math.floor((Math.random() * test.length) + 1)]);
 		exchangeElements(test[coll1.length+coll2.length], test[Math.floor((Math.random() * test.length) + 1)]);
  	//}


  }
  placeHolder = h = document.getElementsByClassName("Ima Xic")[0];
  placeHolder.appendChild(myButton);
}
 
    if (w.self != w.top) {
        return;
    }
 
    addButton();
    setInterval(function()
    { 
      if(!document.getElementById("rulet"))
        addButton(); 
    }, 3000);
})(window);