autopoker.js

// ==UserScript==
// @name         Autopoker
// @namespace    jeroenvanhoof.nl
// @version      0.1
// @description  Pokie poke
// @author       Jeroen van Hoof
// @match        https://www.facebook.com/pokes/
// @grant        none
// ==/UserScript==

function clickElement(e) {
  return e.click();
}

function autoClick() {
  // Select parent of 'new pokes' box, to also include old pokes
  var parent = document.querySelector("#poke_live_new").parentNode;

  // Click on the buttons
  parent.querySelectorAll('.selected').forEach(clickElement);
}

window.addEventListener('load', function() {
    // Init script
    autoClick();

    // Watch DOM updates (mutations)
    new MutationObserver(autoClick).observe(
        document.querySelector('#poke_live_new'),
        {attributes: true, childList: true, characterData: true}
    );
}, false);