Use Twitter directly in your Google Doc, so no one will ever blame you for being social(backup the tweets of list)

TweetListBackupsheets

var CONSUMER_KEY = "<< YOUR KEY HERE >>";
var CONSUMER_SECRET = "<< YOUR SECRET HERE >>";

var OWNER_SCREEN_NAME = "<< YOUR LIST OWNER'S NAME HERE >>";
var SLUG = "<< YOUR LIST NAME HERE >>";
//Then fill the 235682008200790016 into E1


function getConsumerKey() {
  return CONSUMER_KEY;
}

function getConsumerSecret() {
  return CONSUMER_SECRET;
}

function onOpen() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet();
  sheet.addMenu("tweets", [
    { name : "get", functionName : "renderTweetDialog" },
    { name: "post", functionName: "refreshTimeline" }
  ]);
};

function refreshTimeline() {
  authorize();
  
  var requestData = {
    "method": "GET",
    "oAuthServiceName": "twitter",
    "oAuthUseToken": "always"
  };
  
  try { 
    var sheet = SpreadsheetApp.getActiveSpreadsheet();
    var maxTweetId = sheet.getRange("E" + 1).getValue() ;//235667475570761728;
    
    var result = UrlFetchApp.fetch(
     // "https://api.twitter.com/1/statuses/home_timeline.json?include_rts=1",
      "https://api.twitter.com/1/lists/statuses.json?slug=" + SLUG + "&per_page=100&owner_screen_name=" + OWNER_SCREEN_NAME + "&include_rts=true&include_entities=true&since_id="+maxTweetId,
      requestData);//235682008200790016

    var tweets = Utilities.jsonParse(result.getContentText());
    
   /*
    if(1 == tweets.length){
      return ;
    }
   */
    for (var i = tweets.length - 1; i > 0; i--) {//notice here dont use "i > -1" for we will ignore the last tweet to avoid duplicate when next time call this method
      
      sheet.insertRowAfter(1);
      sheet.getRange("A" + (3)).setValue("@" + tweets[i].user.screen_name);
      sheet.getRange("B" + (3)).setValue(tweets[i].text).clearFormat();
      sheet.getRange("C" + (3)).clearContent();
      sheet.getRange("D" + (3)).setFontColor("white").setValue(tweets[i].id);
      sheet.getRange("E" + 1).setValue(tweets[i].id).clearFormat();
      //maxTweetId = tweets[i].id;
      
      if (tweets[i].favorited) {
        sheet.getRange("B" + (3)).setBackgroundColor("yellow");
      }
      
      if (tweets[i].current_user_retweet) {
        sheet.getRange("B" + (3)).setFontWeight("bold");
      }
    }
  }
  catch(e) {
    Logger.log(e); 
  }
}

function onEdit() {
  try {
    
    var sheet = SpreadsheetApp.getActiveSpreadsheet();
    
    if (sheet.getActiveCell().getColumn() != 3) {
      return;
    }
    
    var rowId = sheet.getActiveCell().getRow();
    var command = sheet.getRange("C" + rowId).getValue();
    var tweetId = sheet.getRange("D" + rowId).getValue();
    
    if (command == "") {
      return;
    }
    
    var validCommands = {
      "<3": "fave",
      "rt": "retweet",
      "reply": "reply"
    };
    
    var app = UiApp.createApplication().setTitle('What do you want to tweet today?');
    
    var handler;
    
    if (command in validCommands) {
      switch(validCommands[command]) {
        case "fave":
          handler = app.createServerHandler("fave");
          break;
        case "retweet":
          handler = app.createServerHandler("retweet");
          break;
        case "reply":
          handler = app.createServerHandler("sendTweet");
          break;
      }
    }
    
    var tweet = app.createTextBox().setName("tweetId").setWidth("100%").setValue(tweetId);
    tweet.setVisible(false);
    handler.addCallbackElement(tweet);
    app.setHeight(100);
    
    var sendButton = app.createButton("Yes", handler);
    
    var dialogPanel = app.createFlowPanel();
    dialogPanel.add(tweet);
 
    if (command == "reply") {
      var tweetText = app.createTextBox().setName("tweet").setWidth("100%").setValue(sheet.getRange("A" + rowId).getValue());
      dialogPanel.add(tweetText);
      handler.addCallbackElement(tweetText);
    }
    
    dialogPanel.add(sendButton);
    app.add(dialogPanel);
    sheet.show(app);
    
  } catch (e) {
    Logger.log(err);
  }
}

function fave(e) {
  var requestData = {
    "method": "POST",
    "oAuthServiceName": "twitter",
    "oAuthUseToken": "always"
  };
  
  try {
    authorize();
    var result = UrlFetchApp.fetch(
      "https://api.twitter.com/1/favorites/create/" + e.parameter.tweetId + ".json",
      requestData);
  } catch (err) {
    Logger.log(err);
  }

  var app = UiApp.getActiveApplication();
  app.close();
  return app;
}

function retweet(e) {
  authorize();
  
  var requestData = {
    "method": "POST",
    "oAuthServiceName": "twitter",
    "oAuthUseToken": "always"
  };
  
  try {
    var result = UrlFetchApp.fetch(
      "https://api.twitter.com/1/statuses/retweet/" + e.parameter.tweetId + ".json",
      requestData);
  } catch (err) {
    Logger.log(Utilities.jsonStringify(err));
  }

  var app = UiApp.getActiveApplication();
  app.close();
  return app;
}

function renderTweetDialog() {
  var doc = SpreadsheetApp.getActiveSpreadsheet();
  var app = UiApp.createApplication().setTitle("Send Tweet");
  app.setHeight(100);
  
  var helpLabel = app.createLabel("Enter your tweet below:");
  helpLabel.setStyleAttribute("text-align", "justify");
  var tweet = app.createTextBox().setName("tweet").setWidth("100%");
  var sendHandler = app.createServerClickHandler("sendTweet");
  sendHandler.addCallbackElement(tweet);
  var sendButton = app.createButton("Send Tweet", sendHandler);
  
  var dialogPanel = app.createFlowPanel();
  dialogPanel.add(helpLabel);
  dialogPanel.add(tweet);
  dialogPanel.add(sendButton);
  app.add(dialogPanel);
  doc.show(app);
}

function authorize() {
  var oauthConfig = UrlFetchApp.addOAuthService("twitter");
  
  oauthConfig.setAccessTokenUrl(
    "https://api.twitter.com/oauth/access_token");
  oauthConfig.setRequestTokenUrl(
    "https://api.twitter.com/oauth/request_token");
  oauthConfig.setAuthorizationUrl(
    "https://api.twitter.com/oauth/authorize");
  oauthConfig.setConsumerKey(getConsumerKey());
  oauthConfig.setConsumerSecret(getConsumerSecret());
  
  var requestData = {
    "method": "GET",
    "oAuthServiceName": "twitter",
    "oAuthUseToken": "always"
  };
  try {
    var result = UrlFetchApp.fetch(
      "https://api.twitter.com/1/statuses/mentions.json",
      requestData);
  } catch(e) {
    Logger.log(e);
  }
}

function sendTweet(e) {
  var tweet = e.parameter.tweet;
  var tweetId = e.parameter.tweetId;
  
  authorize();
  // Tweet must be URI encoded in order to make it to Twitter safely
  var encodedTweet = encodeURIComponent(tweet);
  var requestData = {
    "method": "POST",
    "oAuthServiceName": "twitter",
    "oAuthUseToken": "always"
  };
  
  if (tweetId) {
    requestData.payload = { "in_reply_to_status_id": tweetId };
  }
  
  try {
    var result = UrlFetchApp.fetch(
      "https://api.twitter.com/1/statuses/update.json?status=" + encodedTweet,
      requestData);
  } catch (e) {
    Logger.log(e);
  }
    
  var app = UiApp.getActiveApplication();
  app.close();
  return app;
}