Adam D'Angelo is the chief executive officer and co-founder of Quora , an online knowledge market based in Mountain View, California . He was chief technology officer of Facebook , and also served as its vice president of engineering.  He left Facebook in 2008. In June 2009, he started Quora with Charlie Cheever , another early Facebook employee.
In 2003, while attending college, D'Angelo also created the website BuddyZoo, which allowed users to upload their AIM buddy list and compare them with those of other users. The service also generated graphs based on the buddy lists. 
In 2001, he was placed eighth at the USA Computing Olympiad as a high school student and he got a silver medal at the 2002 International Olympiad of Informatics. 
ACM International Collegiate Programming Contest (ICPC) : California Institute of Technology Beavers (team of 3), World Finalists 2003, 2004; North American Champions 2003; World Finals Silver Medals 2004; World Finals co-coach 2005.  
In 2005, he was one of the top 24 finalists in the Algorithm Coding Competition of the International Topcoder Collegiate Challenge.