JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script src="http://documentcloud.github.com/backbone/backbone-min.js"></script>

JavaScript

var Tweet = Backbone.Model.extend();

var Tweets = Backbone.Collection.extend({
    model:Tweet,
    url: 'http://search.twitter.com/search.json?q=obama&callback=?'
});

var tweets = new Tweets;

tweets.fetch();

alert(tweets.length);