One small observation:
I've noticed that when the thread containing any external links in the post is archived by vbulletin, the link displayed in the post seems to lose the nofollow attribute, so I assume that all links are once again followed by search engines who are viewing the archive pages.
You can check this out by clicking on the 'archive' link shown at the bottom of most vBulletin forums, then selecting a thread with an external link in it and viewing the source code.
Is there any way of adding the nofollow code into the archive???
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