<a href="http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation" rel="nofollow">http://en.wikipedia.org/wiki/Correlation_does_not_imply_caus...</a><p>The numbers here are too small and the data too limited to make that claim.  Also search engine changes aren't instantaneous -- I've seen it takes days or weeks for changes found in a crawl of a small site to percolate through Google.  Did Google even crawl the pages in question on the day Survey IO went live?