dataguy - 11:18 pm on Feb 26, 2011 (gmt 0)

Here are some more numbers to consider. My site has 125,000 pages of UGC. Of these pages:

9,700 pages are showing a 39% average drop in Google referrals from a week ago.
1,800 pages are showing a 59% average increase in Google referrals from a week ago.

So my site has pages which have been hurt by this update, and pages which have benefited from this update. Unfortunately it averages out to a 34% drop in Google referrals overall.

Doesn't this mean that this update does not introduce a site-wide penalty?