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"There was once talk of Digg and other social news sites not deserving to be indexed by Google because all they do is link to other sites and provide no added value. This is wrong.  In fact, I'd argue that the comments are often more valuable than the article itself.  Here are my reasons why.\n1. They Cut The Crap\nMost of the information you see on the Internet is second (third, fourth) hand. It's a short summary, link, discussion, or reference to something else.  In this funny creationist quote example, the commenter adds the link to the actual comment (as opposed to the story about the comment on some blog).  In other words, commenters often allow you to skip directly to the source of the news, not a retelling of the story.\n2. They Save You Time on Research\n\nIn this example on a story about The Pirate Bay being hacked and all the accounts stolen, someone actually took the time to find the stolen file which contains the accounts and linked to it. If you actually wanted to see the file for whatever reason, this comment just saved you 15-20 minutes of work.  In fact, the commenters sometimes act like a crack team of investigative reporters, taking the story in a new direction.\n3. They Correct Misinformation\n\nSocial news sites are a huge magnifying glass. Every mistake in the original article, which can range from bad spelling to blatant misinformation, will probably be noticed and commented on by the thousands of users. This can be exceptionally useful, as one quick look at the comments can tell you if a story behind the link is genuinely well written or it's swarming with mistakes. In this example, a hugely popular story (over 6000 diggs) on Digg about a 11 year old girl who supposedly shot some attackers to death is debunked by commenters as fake. \n4. They Expand on the Subject\n\nPeople like to share their knowledge with others. That's why practically every social news topic has links to additional content related to the subject matter at hand. In this case, the commenter provided screenshots of Ubuntu studio.\n5. They Point Out Plagiarism\n\nThis ranges from the standard \"dupe!\" comment to discovering content that was really stolen from somewhere else. Sometimes you'll stumble into a nice story on a well-designed web site, which has all the qualities that makes it seem genuine. And you might even link to it, if it weren't for the commenter who had noticed that the site, in fact, stole the content from another site. This example shows how ardent Digg users in decrying duplicate stories."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2007/05/12/digg-reddit-comments/>