Lucas Jackson / REUTERSYahoo CEO Marissa Mayer arrives for the TIME 100 gala celebrating the magazine's naming of the most influential people in the world for the past year in New York City on April 23, 2013 Updated May 19, 1 p.m. EST: AllThingsD reports that the Yahoo! board has unanimously approved a deal to purchase Tumblr for $1.1 billion. More updates to follow. Updated May 17, 8:20 p.m. EST: