Why is there a difference between the Referring Sites report and the Top Referring Searches From Google report?
November 2011 and newer version
The Referring Sites report (ID 163) provides a list of sites that referred a user to any of the interface end-user pages.
The Top Referring Searches From Google report (ID 216) provides a list of top 10 searches performed from Google. Only scenarios where the user clicked through from Google to an answer/detail page with the answer ID (a_id) will be considered valid information in this report.
Therefore, the results for the same time period for the two reports may have significant differences.
For more information, see the following published answers: