Groupthink and Journalism

To build off my last post, Internet users segmenting themselves based on partisan affiliation or the like is simply symptomatic of the Internet's construction. Groupthink is king, as evidenced by every forum and discussion board in existence. Socially unacceptable behavior finds safe haven in the darkest corners of the Web, breeding even more deviancy (and probably persecution complexes). As the old adage goes, the Internet makes you stupid. For online journalism outlets, unless you've miraculously cultivated a community that attracts people interested in objective, complete reporting and civil debate, your audience will slowly but surely skew toward one segment of society. The question is, is that okay?

So long as a newspaper's content remains unaffected, does it matter that a site's visitors are somewhat homogeneous? This has already been an issue in journalism, as newspaper usually service a distinct geographic area, but is it counterintuitive to similarly limit your audience online?