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My site is not as large as yours but I have deindexed about 3000 pages (80% of my site) of affiliate product pages and seen a rebound of traffic in Panda 2.2 (86% of prePanda).
I am working on adding back some product feed pages selectively and content to get back the prePanda level traffic since I am left with only 20% of the site.
3000 pages deindexed
750 pages left
With these 750 pages you have returned to 86% of what you did pre Panda.
- is this 86% of traffic from only what the 750 pages produced, which is now 20% of the site, or
- is it 86% of the original pre Panda traffic for the entire site
(2) Often times these dynamically created queries produce lots of blank pages. Identify and no index these.
(3) Look in WMT to identify pages that have been penalized. I have found many to be these datafeed pages. I looked at pages prePanda and postPanda.
Where in WMT can you see penalized pages?
How did your conversion rates behave with that improvement?
Is a large scale "no-index" not likely to throw up some flags - especially if it doesn't follow the normal behaviour of your site?
[edited by: tedster at 5:38 am (utc) on Jun 25, 2011]
noindex 6000 product pages, these pages are short 200 word product specific pages