In May, 2013, Yahoo bought Tumblr for $1.1 billion and put $81 million into Karp's pocket with the deal.

On Monday, Thomas and his mom learned that he is in esteemed company as a high-school dropout with a knack for computers: David Karp, 26, sold Tumblr, the online blogging forum he created ...

A key Tumblr employee is out of the company. Derek Gottfrid, who joined from the New York Times in 2010, is leaving, according to a memo David Karp sent to the staff. Gottfrid was almost a "shadow ...