Here is how I found it:
On one website(~500pages) with over of 300 pages indexed in Google, I've used an Iframe linking to other sub-domain in order to display a relevant content.
When I removed the iframe almost immediately, in less than 24 hours my indexed results came up from 300 to 360.
But why?
I started searching on the forums and it appeared that Google penalty filter was triggered by such a huge usage of iframes(mistakenly taken as poisoing attack).
Here is short text from Matt Cutts on this:
"Essentially, our search algorithm saw a large area on the blog that was due to an IFRAME included from another site and that looked spammy to our automatic classifier."
link: http://groups.google.com/group/Google_Webmaster_Help-Indexing/browse_thread/thread/68692a9aefae425f
Solution:
Remove all the iframes that you have and replpace them with ajax calls or just static HTML content.
Wait a few days and run: site:http://yourwebsite.com to see the difference in the results!
Good luck! by Nevyan Neykov
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