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Submission + - Building a Web 2.0 site to promote good comments?

MessyBlob writes: When a website invites comments, with any luck there will be more than a dozen responses, which is when the fun starts: you'll need to show the good ones to add value to the site, but at first you won't know which are good. Here's the problem: How can we get the good comments (among many) to bubble to the top: first you need to make them visible, have them rated, and then ensure that any potentially good new comments can be seen in order to be rated as good.

Most mainstream sites fail to do this, so what's the best way of giving all good comments a chance to add value to a site? Is it simply to have, say, 25% of the comments taken randomly from the lesser-rated list, presented among the highly-rated comments? Does time-ordering do the same? Is there a critical ratio of users vs commenters?

And on the seventh day, He exited from append mode.