Because the evolution of internet technologies has outpaced that of some filtering companies, the number of web sites that are being blocked inadvertently is increasing exponentially, according to the author. What's worse, few people realize the true reason this is happening.

Web sites can be blocked by URL (such as http://www.cnn.com), IP number (such as http://207.25.71.25), or a combination of the two. The URL is the address you type into a

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