Facebook says 50 million user accounts affected by security breach

MENLO PARK, Calif. -- Facebook says it recently discovered a security breach affecting nearly 50 million user accounts.

In a blog post, the company says hackers exploited its "View As" feature, which lets people see what their profiles look like to someone else. Facebook says it has taken steps to fix the security problem and alerted law enforcement.

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To deal with the issue, Facebook reset some logins, so 90 million people have been logged out and will have to log in again. That includes anyone who has been subject to a "View As" lookup in the past year.

Facebook says it doesn't know who's behind the attacks or where they're based.

The hack is the latest security headache for Facebook, which has been dealing with political disinformation campaigns from Russia and elsewhere since 2016.

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