Marissa Mayer, Chief Executive Officer of Yahoo!, poses  during the 43rd Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland, Friday,
Marissa Mayer, Chief Executive Officer of Yahoo!, poses during the 43rd Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland, Friday, Jan. 25, 2013. (AP Photo/Keystone/Laurent Gillieron) (Laurent Gillieron)