fb-invite-all.js

/*
Instructions: 
 1. Copy from line 8 to the end, into a new bookmark "Select all". The url is all the code below. It'll work (trust me).
 2. In Facebook, open the event and Invite > Choose friends
 3. Scroll down to load more of your friends.
 4. Click on the "Select All" bookmark. You should see the friends being selected. It'll take a while, but it'll finish.
*/
javascript:(function(){
  var DELAY = 250;
  var found = document.querySelectorAll('a[aria-checked="false"]');
  var i = 0, el;
  var click = function(){
    if (el = found[i++]){
      el.click();
      setTimeout(click, DELAY);
    }
  };
  click();
})();