Facebook&rsquo;s two-factor authentication is a news that probably all of us know. And, it is not for the very first time that the giant has created such a massive blunder with the budding technology it keeps playing with. Worth mentioning that the two-factor authentication bug was criticized like anything. But the major destruction it caused to the users&rsquo; FB walls was of course detrimental and can never be justified even by the giant social media networking site, at least for the internet-savvy users like me.Facebook admitted that the SMS notification sent by the two-factor authentication was indeed caused by a bug as explained by Facebook chief security officer Alex Stamos in a blog post. The giant explained that a massive bug led to non-security related SMS notifications to various users&rsquo; phone numbers. The SMS notification created a lot of issues for the users for quite some time.Facebook, originally uses an automated number 362-65 denoted as &ldquo;FBOOK&rdquo; for the two-factor authentication, that is truly secured and helps the users to confirm their identity by sending numeric authentication in the form of a code to their verified devices most commonly to their smartphones. That said, the recent notification glitch from Facebook ended up sending notifications to users from the same number that originally belonged to another user. As that was not enough, the SMS notifications from users (to stop the same) were posted to users&rsquo; walls as their status updates (heights of inconvenience).There were fair chances of this incidence remaining unnoticed but all thanks to the Bay Area software engineer, Gabriel Lewi who tweeted the incidence earlier this week. A number of technological critics have also criticized the giant&rsquo;s unethical behavior for not keeping an eye on whatever is happening under its nose. The critics have also pointed out that it may be one among the several strategies planned intentionally by Facebook in order to boost the user engagement.One of the Facebook officials in giant&rsquo;s rescue posted &ldquo;I am sorry for any inconvenience these messages might have caused. We are working to ensure that people who sign up for two-factor authentication won&rsquo;t receive non-security-related notifications from us unless they specifically choose to receive them, and the same will be true for those who signed up in the past, We expect to have the fixes in place in the coming days. To reiterate, this was not an intentional decision; this was a bug.&rdquo; &nbsp;Whatever be the concern, such a massive security blunder from social-media giant like Facebook is not at all expected.