function Twitter() {
  // Encode consumer key and secret
  var tokenUrl = 'https://api.twitter.com/oauth2/token';
  var tokenCredential = Utilities.base64EncodeWebSafe(TWITTER_CONSUMER_KEY + ':' + TWITTER_CONSUMER_SECRET);

  //  Obtain a bearer token with HTTP POST request
  var tokenOptions = {
    headers: {
      Authorization: 'Basic ' + tokenCredential,
      'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',
    },
    method: 'post',
    payload: 'grant_type=client_credentials',
  };

  var responseToken = UrlFetchApp.fetch(tokenUrl, tokenOptions);
  var parsedToken = JSON.parse(responseToken);
  var token = parsedToken.access_token;

  // Authenticate Twitter API requests with the bearer token
  var apiUrl = 'https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=labnol';
  var apiOptions = {
    headers: {
      Authorization: 'Bearer ' + token,
    },
    method: 'get',
  };

  var responseApi = UrlFetchApp.fetch(apiUrl, apiOptions);

  var result = '';

  if (responseApi.getResponseCode() == 200) {
    // Parse the JSON encoded Twitter API response
    var tweets = JSON.parse(responseApi.getContentText());

    if (tweets) {
      for (var i = 0; i < tweets.length; i++) {
        var tweet = tweets[i].text;
        var date = new Date(tweets[i].created_at);
        result += '[' + date.toUTCString() + ']' + tweet + ' / ';
      }
    }
  }

  Logger.log(result);
}