Marissa Mayer, President and CEO of Yahoo!, speaks on stage during a fireside chat session at TechCrunch Disrupt SF 2013 in San Francisco, CaliforniaBy using Jennifer Saba and Alexei Oreskovic NEW YORK/SAN FRANCISCO (Reuters) – Three weeks in the past, Yahoo Inc Chief Government Marissa Mayer strode right into a Ny resort and was greeted like a rock megastar by using a whole lot of advertising executives who snapped footage as she sat down for an interview with journalist Charlie Rose. That same target audience a 12 months in the past would were grousing that Mayer had now not accomplished enough to have interaction Madison Avenue, which is arguably Yahoo's most vital constituent for the reason that Web company derives greater than seventy five p.c of its income from ad sales. …