Any open forum has to constantly work to find ways to foster "witty and worthy comments" without sinking under those that Will Oremus neatly categorizes as "the vicious and the inane." Having just seen both of the latter sorts on our own SftP, you might find it interesting to ponder what the alternatives mean, both for discourse, and for science. Are Internet Comments Bad for Science?
Slate's Will Oremus raises the question of whether Popular Science's decision to stop all public comment "protects science" - or just the institution of Big Science. And, not coincidentally, Big (aka for-profit-über-alles) Journalism.
Also, check the links for more info, research, and details.