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Old 05-28-2012, 10:33 PM   #5
C.Rebecca
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Join Date: Dec 2011
Posts: 247
We think that this occurs because Google routes some search queries during the night to different data centres, perhaps for maintenance reasons. This sometimes results in different rankings because search engine data centres don't always store exactly the same information (they are synchronised routinely, but it's always possible to catch them in an un-synchronised state as well).
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