The social media giant Facebook has revealed that millions of Instagram passwords were stored on its servers in a readable format. Just a day ago, facebook admitted that it "unintentionally" uploaded emails of nearly 1.5 million of new users.

Facebook on Thursday revealed that millions of passwords belonging to the users of its photo-sharing service Instagram were also exposed. He said, "We discovered additional logs of Instagram passwords being stored in a readable format. We now estimate that this issue impacted millions of Instagram users.”

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The company further added, "We will be notifying these users as we did the others. Our investigation has determined that these stored passwords were not internally abused or improperly accessed."

Facebook had found that some user passwords were being stored in a readable format within our internal data storage systems.

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Pedro Canahuati, Vice President, Engineering, Security and Privacy at Facebook wrote, "This caught our attention because our login systems are designed to mask passwords using techniques that make them unreadable. We have fixed these issues and as a precaution will be notifying everyone whose passwords we found stored this way.”

The revelation came to light after a security researcher noticed that "Facebook was asking some users to enter their email passwords when they signed up for new accounts to verify their identities".