I personally think that detecting a porn site is incredibly easy, both for humans and computers.
I think OpenDNS should create a web crawler (en.m.wikipedia.org/wiki/Web_crawler) that counts the number of "bad" keywords (words to describe a porn video in its title for example) on a web page (or if possible the entire site), and if the crawler produces a count over a particular threshold than it should automatically be blocked. If the threshold isnt that significant... It should still be blocked, however in the case that it isn't very significant openDNS community members should be given the opertunity to vote and decide.
^ This process would be far quicker and would provide families with zero-day protection.
This crawler idea will not produce flase positives because no site on the world wide web would contain 100 counts of the keyword ******** (for example) unless it was a porn site.
This crawler idea will work because compared to all the other categories games, weapons etc. Porn would be the easiest to filter out using a keyword count algorithm.
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