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Even on sites where comments are actively screened — like Nytimes.com, where moderators either post or reject submissions — people who think evolution is bunk are generally permitted to voice their view, often to be shouted down by others; for some readers, following such comment threads is part of the fun. But Popular Science and other publications do not have the resources to moderate all comments, so personal attacks and other bits of ugliness can slip in.
Still, the move to silence what many online readers consider a digital town square has ignited a burst of reaction from bloggers and commentators on science and the media, as well as editors at other science magazines. Many sympathized with the feeling that a Wild West of uncouth, illogical commenters can infect the tenor of discussion.
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– http://www.nytimes.com/2013/10/01/science/comment-ban-sets-off-debate.html?ref=todayspaper