The meme that the internet is undermining our community by allowing people to access information that already fits their ideas is 5-10 years old and has been *extensively* discussed. As has the rise of cable news shows focused on people with particular beliefs and, before that, the rise of talk radio.
Adding bookstores to the mix is a variation on the meme, but not one that makes much sense to me - I don't think that bookstores have been very influential in opinion forming at least since the rise of TV, if not radio.
Plus, for the vast majority of people, the availablilty of a bookstore like Borders or B&N is only something happened in the last 15-20 years...and these chains largely replaced mall bookstores.
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