Hacker found a way to hack and change your password like, just he used to change his own password. Facebook fix a very critical vulnerability on the tip of ‘Sow Ching Shiong’, an independent vulnerability researcher. Flaw allows anyone to reset the password of any Facebook user without knowing his last password. At Facebook, there is an option for. compromised accounts at “https://www.facebook.com/hacked”, where Facebook ask one to. change his password for further protection.
Source: https://thehackernews.com/2013/01/hacking-facebook-passwords-like.html