gistfile1.js

$('.message').map(function() { return { author: $(this).find('.nickname').text(), likes: +$(this).find('.likes .count').text() } })
allGrouped = _.groupBy(all, function(val) { return val.author; })
fellas = _.map(allGrouped, function(val, key) { 
  likeTotal = val.map(function(val) { return val.likes; }).reduce(function(a, b) {return a + b;}, 0)
  return { 
    who: key, 
    likeTotal: likeTotal,
    likeAverage: likeTotal / val.length,
    messageTotal: val.length
 }
});