nest()
          .key(d => d.user)
          .entries(data.tweets);
        
        var packableTweets = {id: "All Tweets", values: nestedTweets};
        
        var root = d3.hierarchy(packableTweets, d => d.values)
          .sum(d => d.retweets ? d.retweets.length + d.favorites.length + 1 : undefined);
        
        var partitionLayout = d3.partition()
          .size([2 * Math.PI,250]);
        
        partitionLayout(root);
        
        var arc = d3.arc()
          .innerRadius(d => d.y0)
  