It was just yesterday I was blown away about how the advertisements that popped up on my Facebook page were related to the conversation I was having with Beth. Well, today, it gets even better (but not actually.)

This afternoon, Facebook announced a security breach was discovered, affecting nearly 50 million user accounts.

In a blog post, the company says hackers exploited a bug that affected its "View As" feature, which lets people see what their profiles look like to someone else. That would let attackers steal the "access tokens" Facebook uses to keep people logged in. Having these tokens would allow attackers to "seize control" of user accounts, Facebook said. They also said they have since fixed the security problem and alerted law enforcement.

With this, Facebook also reset some logins, so around 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 also doesn't know who is behind the attacks or where they're based. CEO Mark Zuckerberg said in a call with reporters today that the company doesn't know yet if any of the accounts that were hacked were misused.

Were you forced to log back into Facebook at any point today?


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