It is possible to send bulk tweets from Google Spreadsheet using Google Scripts. To get started, you need to include the OAuth1 libarary in your project, create a new Twitter app on apps.twitter.com and pass the Consumer Keys and API Secret to the Google Script project.
function sendTweet(user, tweet, tweet_type) { var twitterService = getTwitterService_(); // If the Google Apps user has authorized the Twitter service if (twitterService.hasAccess()) { // Remove @ from the Twitter user name, if found var twitterUser = user.trim().replace(/^\@/, ""); var api = "https://api.twitter.com/1.1/"; // Send a public @tweet or direct message (DM) if (tweet_type === "DM") { api += "direct_messages/new.json?screen_name=" + twitterUser + "&text=" + encodeString_(tweet); } else if (tweet_type === "TWEET") { tweet = "@" + twitterUser + " " + tweet; api = "statuses/update.json?status=" + encodeString_(tweet); } var response = twitterService.fetch(api, { method: "POST", muteHttpExceptions: true }); if (response.getResponseCode() === 200) { Logger.log("Tweet sent"); } else { Logger.log("ERROR: " + JSON.parse(response.getContentText()).errors[0].message); } } } // Google Script has trouble sending tweets that contain !*()' // so we replace these variable from the status text function encodeString_(q) { var str = q; str = str.replace(/!/g, 'Ị'); str = str.replace(/\*/g, '×'); str = str.replace(/\(/g, '['); str = str.replace(/\)/g, ']'); str = str.replace(/'/g, '’'); return encodeURIComponent(str); }