Re/code: Martha Nelson has been designated the head of all media for Yahoo, including having purview over its video content efforts, according to an internal memo that went out last week. The former top editor at Time Inc., who arrived at the Silicon Valley Internet giant in August as global editor-in-chief and is also an SVP there, now reports directly to CEO Marissa Mayer. It was a change that came after Kathy Savitt left in September from her post as head of media and also marketing for the top digital job at STX Entertainment.