I mean, just to put another comment below, saying "your links are broken" must not necessarily solve the problem.

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up vote 6 down vote accepted

No point to add another comment, as ordinary users can't edit their comments anyway.

Two scenarios here:

  1. If the whole comment was based on the dead link flag it for moderator attention, choosing "other" and explaining the link is dead - if you have some time, look for mirror link or alternative place with same information and add to the flag report so the moderator might edit the comment instead of deleting it.
  2. If the comment is not all about the dead link, either let it be or like in the above scenario try looking for alternative live link and flag the comment asking to edit it with the new link.
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When I see a comment with a useful but broken link (e.g. to the doc of a standard package), I add a comment below with the updated link. –  smci Dec 8 '11 at 9:05
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@smci that's fine, but in my opinion best approach is editing the original comment, and for this it must be flagged. –  Shadow Wizard Dec 8 '11 at 9:07
    
Shadow Wizard, there are multiple reasons links get broken, and some can be autohandled: a) link had malware or was otherwise objectionable or spam b) site is flaky c) link went stale/ was archived/ site content moved around –  smci Dec 8 '11 at 10:23
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Yes, I agree SO should implement a stale-link detector. URLs in answers is one thing, URLs in comments is another (and generally considered less significant, and more open to abuse). This feature-enhance request has many prior duplicates (some about answers, some about comments, some about both), check these out first before posting a duplicate feature-enhance request:

That's the easy part of the suggestion, there are several possibilities/opinions on what SO should do next, and beware that links should be automatically checked for (unintentional or intentional) malware:

  • mark them as broken/ gray out/ icon to indicate broken
  • some people think let any other high-rep user manually edit in a corrected (or substitute) link
  • possibly notify the original poster (probably not a great idea)
  • (my personal opinion) learn which sites have very ephemeral links and discourage people from posting links from those sites
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For testing links SO could use libCurl –  math Dec 8 '11 at 8:52
    
And also let SO edit comments, not only answers, so users may correct them. –  math Dec 8 '11 at 8:55
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It should be possible for users of a certain reputation to edit comments, this would help solve the issue of redundant links and also help fix spelling and grammar as with questions and answers to make the site more useful

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