instagram_count_to_googe_sheet_2.js

function initFollowerCount() {
  // sets up sheet names and Instagram accounts
  insertFollowerCount("sheet1", "kingandmcgaw");
  insertFollowerCount("sheet2", "nickboyce");
}

function insertFollowerCount(sheetName, instagramAccountName) {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName(sheetName);
  sheet.appendRow([Utilities.formatDate(new Date(), "GMT", "yyyy-MM-dd"), getInstagramFollowerCount(instagramAccountName)]);  
}

function getInstagramFollowerCount(username) {
  var url = "https://www.instagram.com/" + username + "/?__a=1";
  var response = UrlFetchApp.fetch(url).getContentText();
  return JSON.parse(response).user.followed_by.count;
}