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Published online 19 February 2004 | Nature | doi:10.1038/news040216-12
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Sorting e-mail friends from foes
Identifying networks of mutual friends helps filter out spam.
A simple and easily implemented scheme for combating e-mail spam has been devised by two researchers in the United States.
The technique exploits the structure of social networks to quickly determine whether a given message comes from a friend or a spammer.
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