Keeping Passwords Secure - About Facebook
As part of a routine security review in January, we found that some user passwords were being stored in a readable format within our internal data storage systems. We have fixed these issues and as a precaution we will be notifying everyone whose passwords we have found were stored in this way.
21 Mar 2019 ... As part of a routine security review in January, we found that some user passwords were being stored in a readable format within our internal data ...