like every

gistfile1.js

var likes = document.getElementsByClassName('UFILikeLink');
var comment_likes = [];
var post_likes = [];

for(var i = 0; i<likes.length; i++){
    if (likes[i].getAttribute('title') === 'Like this') {
      post_likes.push(likes[i]);
    } else if (likes[i].getAttribute('title') === 'Like this comment') {
      comment_likes.push(likes[i]);
    }
}
var zed = 0;
var ned = 0;
var likeStuff = function(){
  window.setTimeout(function(){
    if(Math.random() < 0.666){
        post_likes[zed].click()
    } else {
comment_likes[ned].click()
    }

    zed++;
ned++;
    if (zed < post_likes.length && ned < comment_likes.length){
      likeStuff();
    } 
  }, 1050);
};

likeStuff();