var Twit = require('twit');
var T = new Twit({
  consumer_key: '...',
  consumer_secret: '...',
  access_token: '...',
  access_token_secret: '...'
});
var stream = T.stream('statuses/sample');
stream.on('tweet', function (tweet) {
  T.post('statuses/retweet/:id', {id: tweet.id});
});