liarbot.js

var twitterAPI = require('node-twitter-api');

var consumerKey = "";
var consumerSecret = "";
var accessToken = "";
var tokenSecret = "";

var myScreenName = "ShoobyBot"

var twitter = new twitterAPI({
    consumerKey: consumerKey,
    consumerSecret: consumerSecret});

twitter.getStream("user", {}, accessToken, tokenSecret, onData);

function onData(error, streamEvent) {
  if (streamEvent.hasOwnProperty('event')) {
      var sourceHandle = streamEvent['source']['screen_name'];
      var userId = streamEvent['source']['id_str'];
      console.log("source: " + streamEvent['source']);
      console.log(userId);
      // a new follower!
      if (streamEvent['event'] == 'follow') {
          twitter.friendships(
              "create",
             {"user_id": userId},
             accessToken,
             tokenSecret,
             function (err, data, resp) { console.log(err); }
          );

          twitter.direct_messages(
            'new',
            {
                "screen_name": sourceHandle,
                "text": "Tell me a secret. I promise I won't tell anyone :)"
            },
            accessToken,
            tokenSecret,
            function (err, data, resp) { console.log(err); }
        );
      }
  }
    if (streamEvent.hasOwnProperty('direct_message')) {
        var dmText = streamEvent['direct_message']['text'];
        var senderName = streamEvent['direct_message']['sender']['screen_name'];
        // streaming API sends us our own direct messages! skip if we're
        // the sender.
        if (senderName == myScreenName) {
            return;
        }
        var outgoingText;

        // send a response!
        twitter.statuses(
            "update",
           {"status": dmText},
           accessToken,
           tokenSecret,
           function (err, data, resp) { console.log(err); }
        );

        twitter.direct_messages(
          'new',
          {
              "screen_name": senderName,
              "text": "Tell me another secret. I swear I won't tell anyone this time :)"
          },
          accessToken,
          tokenSecret,
          function (err, data, resp) { console.log(err); }
      );
    }
}