Joining Facebook itself, it appears as though the passwords of millions of Instagram users were also being stored in a ‘readable format’, though no improper use was determined to have taken place.
Regardless of your usage of Facebook, you’ll have noticed that the company was involved in a fair few privacy-related incidents over the past few months. There was that time when sensitive data was leaked by third-party apps, then the “accidental” upload of email contacts for 1.
