TheOptimizationIdiot - 3:24 am on Apr 20, 2013 (gmt 0)
It almost sounds to me like diberry's talking about advertising mentions, so maybe it's not even based on dollars spent, but rather advertising mentions on "trusted" sites? The "more trusted" the site the mention is on = the more weight it gets or something along those lines?
It would seem like if they counted the mentions in some way that would be a way to "count" nofollow links without actually counting the link for PR purposes. They say they drop the link from the graph, but they don't ever say they drop the fact the URL/Site was mentioned on the page that I've heard anyway.