The Facebook Hack Is an Internet-Wide Failure | WIRED

On Friday, Facebook announced that hackers had leveraged three separate bugs to collect 50 million users’ so-called access tokens, which are the equivalent of digital keys to a Facebook account. With those tokens, hackers can take full control of users’ Facebook accounts, but because of Single Sign-On, they can also access any other website that those 50 million users log into with Facebook.