This is the reason why 'blocked' Facebook contacts were able to message you

ANI | Updated: Jul 03, 2018 13:00 IST

California [United States], July 3 (ANI): If you were wondering why your ex was able to message you on Facebook even after you blocked him or her, blame a bug for that mess up.
Facebook revealed that a privacy bug, impacting 800,000 users, allowed even those who've been blocked on the platform or Messenger">Messenger to become unblocked, Mashable reported.
The bug, which has been now fixed, did not allow the blocked contacts to see content shared by the user, but they may have been able to contact the user who blocked them via Messenger">Messenger. (ANI)