I found this very strange... Did Bing increase clickstream data usage in their algorithm when Google saw Bing results get more Google-like in October of 2010 or not?

Shrum:

  Not so, Bing told me. In October, Bing says it rolled out a new 
  ranking algorithm plus a new experimental system called “Aether” 
  that allows them to test changes in their ranking methodology. 
  That’s what caused the bump that Google saw, not some sudden use 
  of the surfstream, Bing said.

Web (during October 2010):

http://www.google.com/search?q=Bing+new+ranking+algorithm...