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Planet13 - 4:43 am on May 12, 2011 (gmt 0)
Absolutely no scientific data here, but from a lot of the people who have been on this forum or the google webmaster help forum lamenting the implementation of Panda, it seems a disproportionate number of them have sites that rely primarily on user generated content.
Just thinking out loud here: Are UGC sites scraped more frequently than non-UGC sites?