And there's a counterpoint from academic Paul Resnick who argues that it's not that there is filtering on web searches, including social sites like Facebook--indeed, there is, and has been for a long time--but that the filtering is often done clumsily and ineffectively.
As a project manager, author, blogger, and instructor, I use the web a lot for search. I use multiple engines to include google, bing, and blekko; and all of these return different stuff. I also search google scholar, and the archives of many different sites, like slideshare.net, dau.mil, Harvard Business Review, and my local university library online. So, I may be in a bubble, but I don't see a conspiracy here.
On the other hand, I'm sure there's something to Pariser's theme, more so than book sales. So, to anyone who relies on just one search engine: you are in a bubble!
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