After exposing private tweets, plaintext passwords, and personal information for hundreds of thousands of its users, here is a new security blunder social networking company Twitter admitted today. Twitter announced that the phone numbers and email addresses of some users provided for two-factor authentication (2FA) protection had been used for targeted advertising purposes—though the company said it was ‘unintentional.’ In a blog post, the company said an ‘error’ in its ‘Tailored Audiences and Partner Audiences advertising system’ inadvertently used the information provided by users for security reasons to run targeted ads based on the advertisers’ own marketing lists.

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