Aggregating the scores by lol and associating with the name of the user who created it.

gistfile1.js

var aggregate_scores_by_lol = function(votes, lols, users){
  var vote_count = lols.reduce(function(p,lol,i,r){ return p[lol.id] = 0, p; }, {});
  var lol_dictionary = lols.reduce(function(p,lol,i,r){ return p[lol.id] = lol, p}, {});

  votes.forEach(function(vote){ vote_count[vote.lol_id]++; });

  var vote_count_keys = vote_count.map(function(el,ix){ return ix;});

  var sorted_lol_ids = vote_count_keys.sort(function(a, b){
    return vote_count[b] - vote_count[a];
  });

  return sorted_lol_ids.map(function(lol_id){
    var lol = lol_dictionary[lol_id];
    lol_scores.push({
      id: lol_id,
      score: vote_count[lol_id],
      url: lol.lol_url,
      user_id: lol.user_id,
      user_name: users[lol.user_id].name
    });
  };
};