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Target Co. estimates that at least 70 million individuals may have had information including their "names, mailing addresses, phone numbers or email addresses" stolen in a recent data breach. Joe Raedle/Getty Images hide caption

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Attendees of a job fair in California in October fill out paperwork. Justin Sullivan/Getty Images hide caption

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Twitter revoked its new blocking policy after backlash from users. Leon Neal/AFP/Getty Images hide caption

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