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 | |
Type of site | |
|---|---|
| Owner | Prosus N.V. |
| Created by | |
| URL | stackexchange |
| Commercial | Yes |
| Registration | Yes |
| Launched | September 2009[1] (relaunched in January 2011)[2] |
Content license | User contributions under CC BY-SA 2.5, 3.0, and 4.0[3][4] |
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.[5] Currently,[update] Stack Exchange is comprised of 173 communities bringing in over 100 million unique visitors each month.[6] As of February 2025[update] the three most active sites in the network are Stack Overflow (which focuses on computer programming), Mathematics, and Ask Ubuntu (focusing on the Linux distribution Ubuntu.[7]
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.[4][3][10]
In June 2021, Prosus acquired Stack Overflow for $1.8 billion, its first complete acquisition in the area of educational technology.[11]
- ^ Cite error: The named reference
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usatodaywas invoked but never defined (see the help page). - ^ a b "Stack Exchange and Stack Overflow are moving to CC BY-SA 4.0". meta.stackexchange.com. Retrieved September 18, 2019.
- ^ a b "An Update On Creative Commons Licensing". Retrieved March 3, 2020.
- ^ Atwood, Jeff (May 17, 2009). "A Theory of Moderation". Stack Exchange Blog. Archived from the original on May 15, 2017. Retrieved December 16, 2012.
- ^ "About - Stack Exchange". Stack Exchange. Retrieved February 2, 2025.
- ^ "Site ranking by questions per day". Stack Exchange. Archived from the original on February 2, 2025. Retrieved February 2, 2025.
- ^ "All Sites". Stack Exchange. Archived from the original on November 22, 2019. Retrieved April 1, 2017.
- ^ "FAQ – Area 51 – Stack Exchange". Stack Exchange, Inc. 2014. Archived from the original on August 7, 2020. Retrieved June 30, 2014.
- ^ "Legal — Terms of Service". Stack Exchange. December 11, 2014. Archived from the original on January 3, 2012. Retrieved December 21, 2014.
- ^ Dummett, Ben (June 2, 2021). "WSJ News Exclusive | Stack Overflow Sold to Tech Giant Prosus for $1.8 Billion". Wall Street Journal. ISSN 0099-9660. Archived from the original on October 29, 2021. Retrieved June 3, 2021.