FILE - In a Monday, May 20, 2013 file photo, Yahoo CEO Marissa Mayer, and Tumblr Chief Executive David Karp speak during a news conference, in New York. Karp, 26, who founded Tumblr, th

 

              FILE - In a Monday, May 20, 2013 file photo, Yahoo CEO Marissa Mayer, and Tumblr Chief Executive David Karp speak during a news conference, in New York. Karp, 26, who founded Tumblr, th
FILE - In a Monday, May 20, 2013 file photo, Yahoo CEO Marissa Mayer, and Tumblr Chief Executive David Karp speak during a news conference, in New York. Karp, 26, who founded Tumblr, the online blogging forum, and sold it to Yahoo for $1.1 billion, doesn't even have a high school diploma. Karp's mother told the AP that she let him leave school because she realized "he needed the time in the day in order to create." (AP Photo/Frank Franklin II, File)