I think it would be a useful feature to place a button next to
link|edit|retag|flag called for example
report dead link.
After somebody click on it he/she could point to dead link.
- that link would be red
- and the question/answer owner would get a notification
this feature would have 3 main advantages:
- people would know that a link does not contain any useful information more
- more up to date questions/answers (because I hope people will refresh their content after they get the message)
- no more "hey your link is dead" comments
maybe it would be more effective if
dead link = -2 rep
repaired dead link = +2+x rep (x for the effort)
Why can't you just downvote the question and leave a comment yourself?
In this case every people will still click on dead link. After they read the comments and see, that somebody has reported the link, but that wont change the fact that he/she wasted time. But if the link would be red - as in wikipedia too - he/she wont even click on it.
downvote/ close it
bad link != bad question/answer
bad link = a part of the question/answer is bad, see this