Account hijacking is a big problem on Facebook, where attackers manage to guess—or brute-force—your passwords. Two-factor authentication can help make it harder for criminals to take over your account.
When attackers breach the account, the end goal may be just to send spam or to trick your friends into clickjacking scams. The attacker may also be using Facebook as a stepping stone to other attacks. Regardless, it makes sense to protect your account with something a bit stronger than just passwords.
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