When you wonder how your personal information is being used, don't think it is some kind of cyber stalker or someone who uses computer phishing techniques. It's the government.
Under the Freedom of THE PRIVACY ACT OF 1974 various agencies are allowed to share information about you whereby "Computer Matching" allows cross referencing of information about yourself.
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Remember, even if you do not want to have this done, you have no choice. Think about it.