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Re:SeenBefore: A search engine for what you have seen before by chris24 on Monday September 24, 2012 @11:11AM (#4565035)
How does your system define "porn sites"? What about if it was some porn site no one has ever heard of with an innocent-sounding name/domain?
Re:SeenBefore: A search engine for what you have seen before by vidarh on Tuesday September 25, 2012 @05:14AM (#4569388)
He apprently uses a list of 1.7 million sites. But you can also blacklist sites and have any existing entries for it removed:

https://www.seenbefore.com/blacklist_items