https://www.cnet.com/news/facebook-found-millions-of-passwords-stored-in-plain-text-in-internal-investigation/

In a blog post on Thursday, Pedro Canahuati, Facebook's vice president of engineering, security and privacy, said that they found "no evidence to date" that any staffers improperly accessed those passwords. The internal investigation was first reported by Krebs on Security.

Facebook said that it will be notifying hundreds of millions of Facebook Lite users, tens of millions of other Facebook users, and tens of thousands of Instagram users. Facebook said they first discovered this security mistake as part of a routine security review in January. When reached for comment, Facebook spokesperson referred to the blog post."This caught our attention because our login systems are designed to mask passwords using techniques that make them unreadable," Canahuati said in the blog post. "We have fixed these issues and as a precaution we will be notifying everyone whose passwords we have found were stored in this way."