Facebook revealed last month that they stored tens of millions of Facebook password in plain text including thousand of the Instagram password instead of masking it as a human-readable format. New Facebook update states that 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. We will be notifying these users as we did the others. New update states We now estimate. this issue. impacted millions (Facebook users)”]
Source: https://gbhackers.com/instagram-users-password-in-plain-text/