Hackers used loopholes in the security at Amazon and Apple to obtain personal information about a Wired writer, who says his entire digital life was "destroyed." Experts say to ward off hackers, pick good passwords and get rid of unused accounts. iStockphoto.com hide caption

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Your crafty password may not be powerful enough to overcome a cyberattacker. Earlier this month, LinkedIn urged its users to change their passwords after a database was hacked, exposing millions of passwords. Mihai Simonia/iStockphoto.com hide caption

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