Common Knowledge: Communal news in a fragmented world

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http://www.cjr.org/the_news_frontier/common_knowledge.php?page=all  
we can limit our informational intake to facts that mirror and in many ways foster our own realities, without the necessity of externality—which is to say, without the inconvenience of being challenged in our beliefs. - Megan Garber, Columbia Journalism Review source: http://www.cjr.org/the_news_frontier/common_knowledge.php

Argues that the Web as a new source has allowed people to cocoon themselves in their own niche, unchallenged worldview and that this comes at a cost to democracy.