See this article:
http://news.com.com/Cleaning+spam+fr...l?tag=nefd.top

It is a rating system implemented on top of LW. The project Credence is also the one that found the two vulnerabilities in LW this month.

See credence in action (download link) at:
http://www.cs.cornell.edu/People/egs.../software.html

Ciao

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