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Dear All,
                  We have some websites. How we can check if site got affected by penguine / panda. We have observed few things since last few days like impressions are going down and keyword ranking is going down too. Any tools or any steps, to detect it will help us.
Thanks,
Om

Hi,

Nice comments. But one thing, since our site have millions of products and may be most of them we wont get back. So in that case, the url already indexed should get removed and should not crawl again. Thats why we were returning 404, so that crawler will understand that url is no more valid.

Thanks,

Om