---- Matt Cutts and Amit Singhal Share Insider Detail on Panda Update
elsewhen - 10:11 pm on Mar 7, 2011 (gmt 0)
browsee, great find... i think there are a lot of important nuggets from Wysz' post:
Our recent update is designed to reduce rankings for low-quality sites, so the key thing for webmasters to do is make sure their sites are the highest quality possible.
evidence that this is site-based, and not page-by-page
We looked at a variety of signals to detect low quality sites.
further proof that we shouldn't be looking for a magic bullet to explain why some sites were impacted and others weren't. sites could have been impacted for different reasons.
In addition, it's important for webmasters to know that low quality content on part of a site can impact a site's ranking as a whole.
this is just a re-iteration of amit's previous comments.
For this reason, if you believe you've been impacted by this change you should evaluate all the content on your site and do your best to improve the overall quality of the pages on your domain.
further indication that there is some sort of threshold that they are looking for... as browsee quoted above, removing poor quality pages can help you move beyond the quality threshold, and thereby regain your rankings.
the other promising thing about his post is that it really does look like this is not some permanent blacklist... in other words, there are things that can be done to get a site un-downweighted.