<ul data-eligibleForWebStory="false">Hackers took over Elmo's popular X account, posting inappropriate content.Elmo's account, with 684,000 followers, remained silent after offensive posts were removed.Lesson learned: Set up Two-Factor Authentication to enhance online security.Explanation of Two-Factor Authentication importance and setup in a friendly manner for Elmo.Reminder to change passwords regularly and value of 2FA across online accounts.