Facebook now lets you register the devices you regularly use to access the site — your home and work computers and your mobile phone, for instance. Facebook will then send you an email notification (and a text message, if you have SMS notifcations enabled) whenever your account is accessed from a device that isn’t registered. If it’s you, you can simply register the new computer; if you’ve been hacked, you have an immediate heads up.
Facebook also asks additional security questions when you log in from a device it deems suspect.
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