tedster - 6:44 pm on Nov 28, 2010 (gmt 0)
It still takes vigilance (resources) even if you originally sourced the link yourself. Sometimes the businesses you link to drop their domain for various reasons - and someone grabs it as part of a spam scheme. Rather than apply those resources, some websites just use nofollow.
I'm not saying I like this - not one bit. But I do understand it.