Identifying networks of mutual friends helps filter out spam.
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References
Boykin, P. O. & Roychowdhury, V. Personal email networks: an effective anti-spam tool. Preprint, http://www.arxiv.org/abs/cond-mat/0402143, (2004).
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Ball, P. Sorting e-mail friends from foes. Nature (2004). https://doi.org/10.1038/news040216-12
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DOI: https://doi.org/10.1038/news040216-12