Online advertising company Chitika did investigate their search engine statistics & did come to the conclusion that "Linux users love Google & hates Microsoft"

Chitika compared the OS & search engine data for 163,211,927 searches – a sample of the Chitika network’s search data from July 30th through August 16th.

It's quite surprising that 94.61% of all Linux search traffic was from Google, compared with 78.54% of Windows user searches. Just 0.77% of Linux searches were from Bing (Microsoft's new search engine). Even Ask.com outdoes Bing for Linux users.

Look here for the original article at the Chitika site.