code: def post_tweet(user_id, message, additional_params={}):
      
      url = "https://api.twitter.com/1.1/statuses/update.json"    
      params = { "status" : message }
      params.update(additional_params)
      r = make_twitter_request(url, user_id, params, request_type='POST')
      print (r.text)
      return "Successfully posted a tweet {}".format(message)
docs: Helper function to post a tweet