Extract Popular Hashtags from twitter

I am trying to retrieve the most popular hashtags on twitter using ntwitter module for node.js

/*Set Twitter Properties */
    var twitterKey= new twitter(
        {
            consumer_key: 'xxxx',
            consumer_secret: 'xxxx',
            access_token_key: 'xxxx',
            access_token_secret: 'xxxx' 
        }
    );
    /*On Connection from a client fetch twitter status keeping track of #tags*/
    io.sockets.on('connection', function(socket)
    {
            twitterKey.stream('statuses/filter', {track: ['#']}, function(stream) {

            stream.on('data',function(data)
            {
                 console.log(data.text);
            }
    }

I have previously used the track parameter to extract tweets with certain keywords. I have created a data structure to keep track of the top repeating hashtags, however, I feel my approach of extracting hash tags isn't the best way.