FILE - In this Oct. 1, 2012 file photo, Tumblr founder David Karp participates in the "Bloomberg Leadership Summit" seminar in New York. Karp, 26, who founded Tumblr, the online bloggin

 

              FILE - In this Oct. 1, 2012 file photo, Tumblr founder David Karp participates in the "Bloomberg Leadership Summit" seminar in New York. Karp, 26, who founded Tumblr, the online bloggin
FILE - In this Oct. 1, 2012 file photo, Tumblr founder David Karp participates in the "Bloomberg Leadership Summit" seminar 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/Charles Sykes/Invision for Advertising Week)