---- Documenting my attempt to re-rank after "Farmer" update
caribguy - 10:11 pm on Mar 6, 2011 (gmt 0)
Thank you for the YT link, Browsee.
The point of my comment, and I believe it is in line with indyank's quote
Never do a nofollow for the sake of preserving PR to your site as google has long changed the way they distribute link juice.By having a nofollow you are just wasting the juice.It is better to credit it to the source.
Offcourse, this doesn't mean that you should not use nofollow at all.But it should be rare and there should never be a situation where you want to write most of your stories referring sources that you don't trust.
is that while it may well be technically possible to implement a js-based nofollow scheme (!), I don't believe that it is recommended as some sort of cure all method.
If you just wanted to alert G to the fact that it should not pass PR juice to a class of external links (e.g. user generated content, paid links), then I'd just stick with the suggestion by P1R above to use VALID and PURE HTML.
Nothing wrong with rel=nofollow in those situations, but you may also want to examine the use of a redirect that G is not allowed to crawl.