Answer: Quite possibly because Facebook’s already forced you to log out and back into your account today.

The news: Facebook said hackers exploited a software flaw to access the records of almost 50 million customers. The firm said it had fixed the vulnerability and reported the breach to law enforcement.

The hack: The company said that the hackers had exploited a coding glitch that affected the service’s “View As” feature, which lets people see what their own profile looks like when someone else takes a look at it online. This allowed them to get hold of digital “tokens,” which are software keys that let people access their account without having to log back in every time.

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