"Search engines are said to crawl only 16-20% of the Internet ... Danny Sullivan, a search engine expert and formerly of Search Engine Watch, wrote in 2000 that the invisible Web was about 500 times Google's (then) index of one billion pages."
"Search engines are said to crawl only 16-20% of the Internet ... Danny Sullivan, a search engine expert and formerly of Search Engine Watch, wrote in 2000 that the invisible Web was about 500 times Google's (then) index of one billion pages."
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