Istituto di Scienza e Tecnologie dell'Informazione     
Donato D., Gionis A., Murdock V., Silvestri F. Method of detecting spam hosts based on clustering the host graph. Patent n. 20090089244. Registered in New York on 2007.
Systems and methods for identifying spam hosts are disclosed in which hosts are known to the system and initially classified as spam or non-spam. Then the hosts are partitioned into clusters based on how each host is linked to other hosts. Each cluster is then analyzed and, depending on the number of spam and non-spam hosts it contains, the cluster may be classified as a spam cluster or a non-spam cluster. The hosts within the cluster may then be reclassified based on the cluster's classification. The results may then be used in many different ways including to filter search results based on host classifications so that spam hosts are not displayed or displayed last in a results set.
URL: http://www.freepatentsonline.com/y2009/0089244.html
Subject Web Spam detection
H.4.m Information Systems Applications. Miscellaneous

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