Intelligence officials are warning their employees not to end up like Central Intelligence Agency Director John Brennan, who recently had his email hacked.

On Friday, the National Counterintelligence and Security Center released the second in a four-part series of videos from a campaign it calls "Know the Risk — Raise Your Shield." The current phase of the campaign is intended to warn viewers about so-called "social engineering" scams.

The campaign is "intended to help build public awareness of the inherent dangers that the use of social media — Facebook, Twitter, etc. — could present when appropriate protective measures are not taken," the agency said in a press release.

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Those websites are the most common means by which criminals acquire the information necessary to steal passwords through social engineering, which usually involves finding the information to reset a user's password. That can include a person's birthdate, place of birth, or the answers to other common security questions. Such scams can usually be prevented with multi-factor authentication, or the use of a secondary device to confirm login attempts.

Hackers announced this week that they accessed CIA Director John Brennan's personal AOL email account through a similar social engineering scheme. Instead of using social media, they contacted Verizon and tricked workers into providing a few details on his personal life.

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