tedster - 8:46 pm on Feb 12, 2011 (gmt 0) [edited by: tedster at 8:57 pm (utc) on Feb 12, 2011]
I thought it was interesting that the algorithmic change is described as taking so long to roll out. We have been noticing for months how big algo changes first show up and then seem to bounce around for days. This article seems to point in the same direction. I'm thinking statistical sampling and feedback - machine learning of some kind.
It seems that "how we count backlinks" has been a common description of algo changes for quite a while now. Makes me wonder if Google's address to content farms will also be in this area. And also if a site is tagged as hosting a low value outbound link, might that roll over to other outbound links they host.
I know that Google can negate link equity flow at the level of individual link, the whole page or the whole domain. But I wonder if enough "individual problem links" could spell bigger trouble for the hosting site.
[edited by: tedster at 8:57 pm (utc) on Feb 12, 2011]