From a comment I made in a WF discussion.

Ord Allenbea's conclusion about quality content is dead-on. But the first statement about follow and nofollow is a fast-growing and erroneous statement. Per Google:

...

I spend an inordinate amount of time with clients dealing with urban myths, legends, half-truths, and unsubstantiated claims. Often, they have spent a considerable portion of their advertising budget on snake oil.

Extraordinary claims require extraordinary evidence.