Pseudonymity is an important component of the reputation systems found in online auction services (such as eBay), discussion sites (such as Slashdot), and collaborative knowledge development sites (such as Wikipedia).
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It is possible, in theory, to create an unlinkable Wikipedia pseudonym by using an Open proxy, a Web server that disguises the user's IP address.
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A more modern example is all of the Federalist Papers, which were signed by Publius, a pseudonym representing the trio of James Madison, Alexander Hamilton, and John Jay.