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We host a couple of significant scientific sites, not commercial sites I might add. We wouldn't know SEO if it hit us in the face, so we have done nothing whatsoever to justify any type of penalty or downgrade.
One of these sites has today disappeared from Google to all intents and purposes. Major searches on key terms which the site covers fail to show it, even though in value terms it should be #1 on these, as it remains on Yahoo and MSN. It does appear on semi-related strange search terms though.
This doesn't lose us any money, but it is somewhat inconvenient for the public in this niche area, as they would expect to find us. There is probably more harm done to Google in this respect. Peculiar.
The re-assurance is that I would be surprised if this state of affairs remained, as there must be many many other key sites adrift as well. It cannot help Google.
Best of luck to you all.
Erm - this does not re-assure - that has been happening for months for lots of sites.
It just underlines the difficulties that Google is having.
However, I have been here long enough to try not to think on a daily basis. I will wait for a while yet.
Due to our dynamic structure the second figure is ok. We had all the last years between 100.000 and 170.000 entries.
Maybe some other dup content problem is showing up.
But I will not take any action until next monday. If the site will still be buried I'll consider starting up from the scratch again - new domain, new structure, new design.
It is really frustrating to see six years of hard work going down the drain.
Just because the rubber falls off the end of your pencil does mean you have to buy a new one.