tedster - 6:07 pm on Feb 28, 2011 (gmt 0)
We do have reports here of losses from ten year old sites that were never negatively affected before - not by Florida, not by Jagger, not by Mayday, not by nothing.
Google's new algo component is measuring something that they never tried to measure before - and its first incarnation looks pretty rough. I'm personally familiar with some of the sites on the big list from Sistrix, and I'm astounded that they took such a big hit.
Sites that took a hit were not PEANALIZED, and that's important to appreciate: not a penalty! There is no message in their Webmaster Tools about any problem.
Still, this new algorithm component - the first we know of that tries to measure quality instead of relevance - has decided that these pages don't measure up. 12% of all searches were affected - that's huge!
We don't know how this will look going forward. After more than a decade, we do have a good idea of what "relevance signals" look like. But what do "quality signals" look like? We're just beginning to work on that. I don't think we'll have big answers tomorrow or even Wednesday.