So where are Google and the W3C in all this?
Imagine a "type=untrusted" tag added to the <a href... element (by the comment software, after the commenter has submitted the comment). It would mean that the URI quoted did not come from the principal author(s) of a page, and so should be treated with suspicion.
Google could then use it to severely downgrade the importance of the link, which would then make it that much less useful to spammers. ("How much" could be a delicate balancing act: possibly a Google that plain ignored all such links would be more useful than one that could be spammed and subverted this way.)
Actually, they probably should show alerts on that last one anyway...
It shouldn't be so difficult for the site engine to add that automatically: it's one line of sed. There aren't that many popular comment-based packages, and the option to make the site much less useful for spam should be popular with users.
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