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From the Graham Cluley blog

Anyone who works in computer security knows that they should have two-factor authentication (2FA) enabled on their accounts.

2FA provides an additional layer of security. A hacker might be able to guess, steal, or brute force the password on your accounts - but they won’t be able to gain access unless they also have a time-based one-time password.

So, how come Mandiant didn’t have 2FA protecting its Twitter account?