An interesting article (link below) that discusses the deep web which is not generally accessible by standard search engines.
“By its very nature, the size of the Deep Web is difficult to calculate. But top university researchers say the Web you know — Facebook (FB, Fortune 500), Wikipedia, news — makes up less than 1% of the entire World Wide Web.” (Pagliery)
This article seems to have some relevance to the Berners-Lee, Tim, et al. “The World-Wide Web.” reading in The New Media Reader.
Pagliery, JoseMarch. “The Deep Web You Don’t Know About”. March 10, 2014. CNN Money. Web.