Few sites provide an easier source of basic personal information than Facebook. While it is possible to keep all personal information on Facebook private, users frequently reveal their emails, phone numbers, addresses, birth dates and other pieces of private data. As security experts and hackers know, this kind of information is often used as passwords or as answers to secret security questions. While the majority of unprotected information is mined for targeted advertising, it can be a means to more pernicious ends such as profile cloning and, ultimately, identity theft.
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