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Facebook is probing a series of security failures in which employees built applications that logged unencrypted password data for Facebook users and stored it in plain text on internal company servers. That’s according to a senior Facebook employee who is familiar with the investigation and who spoke on condition of anonymity because they were not authorized to speak to the press.
The Facebook source said the investigation so far indicates between 200 million and 600 million
We have fixed these issues and as a precaution we will be notifying everyone whose passwords we have found were stored in this way.
(Update on April 18, 2019 at 7AM PT: Since this post was published, we discovered additional logs of Instagram passwords being stored in a readable format. We now estimate that this issue impacted millions of Instagram users.