Using Twitter.prototype.postTweet

app.js

//TwitterService will now look like this

app.factory('TwitterService', function($http, $q){
  
  var createTweet = function(tweet){
    //we need to URL encode our string.
    var urlEncodedTweet = encodeURI(tweet);
    var d = $q.defer();
    $http.post('/twitter/tweet', {tweet: urlEncodedTweet})
      .success(function(data){
        return d.resolve(data);
      })
      .error(function(error){
        return d.reject(error);
      });
    return d.promise;
  }
  
  var getUser = function(username){
    var d = $q.defer();
    $http.post('/twitter/user', {username : username})
      .success(function(data){
        return d.resolve(data);
      })
      .error(function(error){
        return d.reject(error);
      });
    return d.promise;
  };

  return {
    getUser : getUser,
    createTweet : createTweet
  }
});

index.js

//Add the following to index.js

//post to update status (create a tweet)
//Note! params must be URL encoded, we will encode things in app.js
app.post('/twitter/tweet', function (req, res) {
	var params = req.body.tweet;
	var tweet = twitter.postTweet(params, function(error, response, body){
		res.status(400).send({
			"error" : "Oops something went wrong!"
		});
	}, function(data){
		res.send({
			result : data
		});
	});
});