Marissa Mayer, Chief Executive Officer of Yahoo!,  smiles  during the 43rd Annual Meeting of the World Economic Forum, WEF, in Davos, Switzerland, Friday,
Marissa Mayer, Chief Executive Officer of Yahoo!, smiles 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)