Originally Posted by inertia

I am involved with link building for a couple of clients and regularly post on industry blogs on their behalf. This does bring them some direct traffic but it's minimal. I am analysing whether the time spent by me would be better spent on content creation...

Now most blog comments have nofollow added to them is posting on blogs worth it? I know i will get a chorus of "do it for the traffic" but to be honest i have seen very little traffic from the blogs which i post on. This raises the question of whether it is worth the time to do this?

Do people think that the nofollow attribute completely discounts the link or does it just stop PR transfer? Does no follow link text still have an effect on SERPs and semantics?

Also, what (if any) is the difference between rel="nofollow" and rel="external nofollow"?

Any advice would be appreciated.