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[edited by: tedster at 8:38 pm (utc) on Feb 26, 2011]
bottom line is that I think its a combo of things, no magic bullet.
[edited by: indyank at 6:59 am (utc) on Feb 26, 2011]
There is a theory floating around that the cause of this massacre is too many pages with not enough link juice to support each page."
I wrote a DMCA complaint and Google said "Thanks!
Thank you for using our online DMCA complaint form. You should receive a confirmation email shortly."
It's been a few hours since then and I received no confirmation.
Interesting: searching for 2 affected sites site:example.com not showing homepage at first result, like was before. For competitor sites who are not affected shows homepage at first result.
It's essentially a massive multi-variate testing machine
it is likely that the changes that have just been rolled out have been verified and improved through a few months of low-profile multi-variate testing going on in the background
is this data primarily at the site-wide level, or at the page-specific level
[edited by: indyank at 3:39 pm (utc) on Feb 26, 2011]
Let's make sure of this: You search for site:example.com and the first page listed is not www.example.com but www.example.com/other-page.html ? Do you rank for your 'example' (domain keyword) ? Do you have a fresh cache?
Long time ago there was a penalty, link related, where the first page would be demoted and by extension everything else too.
The affected one is the largest and most high-quality of them all. It's the one that garners the most attention and traffic