Stack Exchange

Network of Q&A sites based in New York City / From Wikipedia, the free encyclopedia

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Stack Exchange is a network of question-and-answer (Q&A) websites on topics in diverse fields, each site covering a specific topic, where questions, answers, and users are subject to a reputation award process. The reputation system allows the sites to be self-moderating.[6] As of March 2023, the three most actively-viewed sites in the network are Stack Overflow which focuses on computer programming, Unix & Linux, and Mathematics.[7]

Quick facts: Type of business, Type of site, Headquarters,...
Stack Exchange Network
Type of businessPrivate
Type of site
Knowledge market
Question and answer
HeadquartersNew York City, New York, U.S.
OwnerStack Exchange Inc.[1]
Created by Edit this at Wikidata
LaunchedSeptember 2009; 13 years ago (2009-09)[2]
(relaunched in January 2011)[3]
Content license
User contributions under CC BY-SA 2.5, 3.0, and 4.0[4][5]
Super User logo

All sites in the network are modeled after the initial site Stack Overflow which was created by Jeff Atwood and Joel Spolsky in 2008. Further Q&A sites in the network are established, defined and eventually  if found relevant  brought to creation by registered users through a special site named Area 51.[8][9]

User contributions since May 2, 2018 are licensed under Creative Commons Attribution-ShareAlike 4.0 International. Older content, contributed while the site used the Creative Commons Attribution-ShareAlike 3.0 Unported license or the earlier Creative Commons Attribution-ShareAlike 2.5 Unported license, remains licensed under the license in force at the time it was contributed.[5][4][10]

In June 2021, Prosus acquired Stack Overflow for $1.8 billion, which was the first complete acquisition of Prosus in educational technology.[11]