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Panda 2.2 is a much more subtle change than Panda 1.0 or 2.0 were. .  A few of us in the industry believe that Panda 2.2 was rolled out this past week.  There's subtle changes for many sites, and that's what it seems to be, however it's both too early to tell, and as EGOL points out, there are many other possible causes for any single site.