November data for Internet search market share from web metrics firm Hitwise show Google (GOOG) expanded its leading position to 65.1%, compared to 64.5% in Oct. and 61.8% last Nov., while Yahoo! (YHOO) slipped to 21.2%, versus 21.7% in Oct. and 22.4% last year. Microsoft’s (MSFT) share fell to 7.1% against readings of 7.4% in Oct. and 9.8% last year.