Stack Exchange

Not to be confused with Stock Exchange.
This article is about the network of collaborative Q&A sites. For the first site in the network, see Stack Overflow.
"Super User" redirects here. For a user account with special privileges, see superuser.

Stack Exchange Network
Type of site
OwnerProsus N.V.
Created by
URLstackexchange.com Edit this at Wikidata
CommercialYes
RegistrationYes
LaunchedSeptember 2009; 15 years ago (2009-09)[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] 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.[6]

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.[7][8]

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][9]

In June 2021, Prosus acquired Stack Overflow for $1.8 billion, its first complete acquisition in the area of educational technology.[10]

History

Founding and growth

Super User logo

In 2008, Jeff Atwood and Joel Spolsky created Stack Overflow, a question-and-answer website for computer programming questions, which they described as an alternative to the programmer forum Experts-Exchange.[11] In 2009, they started additional sites based on the Stack Overflow model: Server Fault for questions related to system administration and Super User for questions from computer power users.[12]

In September 2009, Spolsky's company, Fog Creek Software, released a beta version of the Stack Exchange 1.0 platform[1] as a way for third parties to create their own communities based on the software behind Stack Overflow, with monthly fees.[13] This white label service was not successful, with few customers and slow growing communities.[14]

In May 2010, Stack Overflow (as its own new company) raised US$6 million in venture capital from Union Square Ventures and other investors, and it switched its focus to developing new sites for answering questions on specific subjects,[14] Stack Exchange 2.0. Users vote on new site topics in a staging area called Area 51, where algorithms determine which suggested site topics have critical mass and should be created.[11] In November 2010, Stack Exchange site topics in "beta testing" included physics, mathematics, and writing.[15] Stack Exchange publicly launched in January 2011 with 33 Web sites; it had 27 employees[16] and 1.5 million users at the time, and it included advertising.[2] At that time, it was compared to Quora, founded in 2009, which similarly specializes in expert answers.[2] Other competing sites include WikiAnswers and Yahoo! Answers.[17]

In February 2011, Stack Overflow released an associated job board called Careers 2.0, charging fees to recruiters for access, which later re-branded to Stack Overflow Careers.[18] In March 2011, Stack Overflow raised US$12 million in additional venture funding, and the company renamed itself to Stack Exchange, Inc.[19] It is based in Manhattan.[20] In February 2012, Atwood left the company.[21]

On April 18, 2013 CipherCloud issued Digital Millennium Copyright Act (DMCA) takedown notices in an attempt to block discussion of possible weaknesses of their encryption algorithm.[22][23] The Stack Exchange Crypto group discussion on the algorithm was censored, but it was later restored without pictures.[24]

As of September 2015, "Stack Exchange" no longer refers to the company, only the network of question-and-answer websites. Instead, the company is now referred to as Stack Overflow.[25]

In 2016, Stack Exchange added a variety of new sites which pushed the boundaries of the typical question-and-answer site.[26] For example, Puzzling offers a platform for users who already know the answer to questions to challenge their peers to solve the problems unlike traditional Q–A sites where the poster does not know the answer.[26]

Declining relationship between users and company

In 2016, Stack Exchange announced the second iteration of the Stack Exchange Quality Project, in which they attempt to implement specific important features requested by the community to meet a distinct high-priority set of goals. After users enthusiastically responded with feature ideas, they complained that there was insufficient action on the company's part.[27]

In October 2018, the company removed its Interpersonal Skills site from the Hot Network Questions list after a complaint on Twitter, and an employee (who was part of the SRE team, which was not community-facing) posted tweets attacking moderators.[28]

Late 2019 controversies

To start, in June 2019, more advertisements were added causing a large dispute.[29] On September 27, 2019, a moderator of multiple Stack Exchange sites, specifically Monica Cellio, was dismissed from her moderator position, allegedly connected to behavior associated with upcoming changes to the Code of Conduct (CoC) relating to gender pronouns.[30][31][32] Many other moderators resigned or suspended their moderator activity in response to the dismissal. The company responded with two very poorly received messages which have since been deleted,[33] and by a slightly less negatively-received apology several days later.[34] In December 2019, the company posted a message, stating that they and the moderator had come to an agreement and expressing regret for any damage to her reputation.[35][36] Nevertheless, this, plus the sudden departure of multiple community managers (Stack Exchange employees who interact with the community), led to an erosion of trust between the community and the company—convincing many of the site's most prolific users, including many community-elected moderators and a community manager, to depart within the next few months.[37][38]

2019–2020 licensing change announcements

On September 2, 2019, the terms of service (and the footer of every page served) changed to referencing the "Creative Commons Attribution-ShareAlike" (CC BY-SA) license's 4.0 version instead of its 3.0 version.[3] Users were puzzled as to how Stack Overflow acquired the rights for this relicensing of their past contributions,[39] with some users explicitly stating that they did not intend their contributions to be licensed under CC BY-SA 4.0.[40][41] Users were concerned that, if the relicensing was found to be a breach of CC BY-SA 3.0, Stack Exchange would have made itself unable to distribute the content under any CC BY-SA license (and that the footer's license statement could be erroneous), and would have to rely on its "perpetual and irrevocable right and license to use, copy, cache, publish, display, distribute, modify, create derivative works and store" the content instead.[42] On September 27, an official Stack Exchange reply stated it had been an "important step", but declined to discuss with the community the legal basis for the relicensing.[43]

In March 2020, a post announced that content contributed before May 2, 2018 was available under a CC BY-SA 3.0 license.[4] In the ensuing discussion, several users asked about the similar situation in August 2010, when Stack Exchange switched from accepting CC BY-SA 2.5 contributions to 3.0. A representative of the corporation noted "we are looking [...] to show v2.5 for posts predating this change but cannot commit to it yet". Some users were unconvinced that the September 2019 announcement was not a breach of CC BY-SA 3.0 that would have caused its termination, and some answers were not placated by the dateline chosen.[44] In the ensuing discussion, Stack Overflow staff declined to comment.[45]

June - August 2023 moderation strike

In mid-2023, Stack Exchange made several changes regarding its policies around content generated by artificial intelligence which resulted in a strike of a portion of its volunteer moderators. The protest centered around a policy posted to moderators on May 29 stating that the use of AI-detection tools were not permitted to be used as part of moderation. In a statement, Stack Exchange confirmed that 11% of moderators had ceased content moderation in response to this policy.[46] This would grow to more than 23% of all moderators on the network by June 22, including more than 70% of all Stack Overflow moderators.[47]

The strike began with a post to Meta Stack Exchange, which raised concerns regarding the quality and accuracy of AI-generated content, and the lack of transparency from Stack Exchange surrounding this policy change.[48] Moderators also stated that the version of the policy released to the public differed from the version they had received on the moderator-only forum, notably in that the public version did not include language requiring that moderators stop restricting all AI content.[49]

Negotiations between Stack Exchange and moderators resulted in new policies allowing moderators to remove AI content when there is a strong indicator of GPT usage, and a commitment from the site to continue to provide data and API access. At the conclusion of negotiations, the strike ended on August 2, 2023.[50]

Site features

Reputation and badges

The primary purpose of each Stack Exchange site is to enable users to post questions and answer them.[15] Users can vote on both answers and questions, and through this process users earn reputation points, a form of gamification.[21][51] This voting system was compared to Digg when the Stack Exchange platform was first released.[13] Users receive privileges by collecting reputation points, ranging from the ability to vote and comment on questions and answers to the ability to moderate many aspects of the site.[51] Due to the prominence of Stack Exchange profiles in web search results and the Stack Overflow Careers job board, users may have reason to game the system.[18] Along with posting questions and answers, users can add comments to them and edit text written by others.[52] Each Stack Exchange site has a "meta" section where users can settle disputes, in the style of MetaFilter's "MetaTalk" forum, because the self-moderation system for questions and answers can lead to significant arguments.[53]

Badges are awarded for asking and answering, participating in meta, and for moderating the site. There are bronze, silver and gold badges and appear on users' profile pages as well as their posts.[54][55]

Moderators and election process

Moderators are responsible for managing the site, such as by following up on flagged posts, locking and protecting posts, suspending users, and deleting the worst posts (including misinformation) on the site. According to the Stack Exchange philosophy, they should be minimally involved in the site. They are also expected to lead by example, as well as to show respect to other users.[56]

To become a moderator, users have to participate in an election. Elections are called as needed by the Stack Exchange Community Team for a designated number of seats. Users must first nominate themselves and have at least 300 reputation (3,000 on Stack Overflow and 1,000 on Math Stack Exchange), while also being in good standing, such as not having been suspended during the past year. Aside from introducing themselves and explaining why they would be a good moderator, users must also answer questions written by the community. Nominations can be withdrawn at any time.[57]

After this, users vote on the candidates in a primary, where the vote tally is made public. The top 10 nominees advance to the election stage, where any user with at least 150 reputation is allowed to vote. A ranked-choice voting system is used where users can rank all the candidates if they wish. Votes are tallied using the Meek STV method (single transferable vote) which allows fractional parts of a vote to be counted.[58]

Bounties

Stack Exchange allows users to donate some of their reputation to help questions receive answers or better answers, as well as to incentivize users to answer. This is called a 'bounty' and can be applied on questions 48 hours after being asked, lasting for 7 days plus a grace period of 24 hours. The minimum bounty is set at 50 reputation, except if the user has already answered the question or has offered a previous bounty on the question. Bounties cannot be cancelled, and reputation cannot be refunded from a bounty, even if the question did not receive an answer.[59][60]

Technologies used

Stack Exchange uses IIS, SQL Server,[61] and the ASP.NET framework,[61] all from a single code base for every Stack Exchange site (except Area 51, which runs off a fork of the Stack Overflow code base).[62] Blogs formerly used WordPress, but they have been discontinued.[63] The team also uses Redis, HAProxy and Elasticsearch.[61]

Stack Exchange tries to stay up to date with the newest technologies from Microsoft, usually using the latest releases of any given framework. The code is primarily written in C# ASP.NET MVC using the Razor View Engine. The preferred IDE is Visual Studio and the data layers uses Dapper for data access.[64]

The site makes use of URL slugs in addition to numeric identifiers for question URLs.

Site creation process

Every new site created in the Stack Exchange Network goes through a detailed review process on a site called Area 51, that is consisting of four steps:[8][65][66][67]

  • Definition: A public proposal must be drafted and posted so that any member of the community can discuss the proposal and vote on it. This allows a collaborative proposal to emerge over time. The proposal must address these four key issues
    1. the topic of the site
    2. the targeted audience
    3. forty exemplary questions, upvoted at least 10 times from the community
    4. 60 followers from the community
  • Commitment: First, 200 users interested in the new site are asked to formally commit and support the site by actively participating and contributing to it by asking or answering 10 questions during the FIRDR six months of the public beta. Second, 100 users interested in the new site that have committed with over 200 reputation on another site on the network. Finally, it requires a commitment score of 500, which uses the following formula:[68]
    1. PrelimScore = SUM(Reputation >= 200 ? 0.233 * ln(Reputation-101) - 0.75 : 0) + 1.5
    2. UserScore = PrelimScore * 0.9 ^ (DAYS / 180)
  • Beta: A live test version of this site is tested out, in two steps.
  1. Private Beta:If the concept receives 100% commitment (reaches the requirements listed above), the site enters the private beta phase, where committed members begin actively using the site and publicizing it. It must remain for at least 35 days (or 5 weeks).
  2. Public Beta: The site is open to the public for a long period. This allows the creators to ensure that the site reaches critical mass before it is fully launched. It much remain for at least 180 days (or 6 months) of public beta, and 215 total days of beta (31 weeks).
  • Graduation: If the site has at least 1000 open questions, and 70% of questions or more have at least 1 upvoted answer, it is granted a "graduation" and fully launched.[69]

Notable users

Nobel Prize winners

Fields Medal winners

Founders

Other notable scientists and mathematicians

See also

References

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Oona O'Neill

Oona O'NeillO'Neill di Santa Barbara, California pada 1943Lahir(1925-05-14)14 Mei 1925Warwick Parish, BermudaMeninggal27 September 1991(1991-09-27) (umur 66)Corsier-sur-Vevey, SwissSebab meninggalKanker pankreasPendidikanBrearley SchoolSuami/istriCharlie Chaplin ​ ​(m. 1943; invalid reason 1977)​AnakGeraldineMichaelJosephineVictoriaEugeneJaneAnnetteChristopherOrang tuaEugene O'Neill (bapak)Agnes Boulton (ibu) Oona O'Neill Chaplin, Lady...

 

Данілов Олексій Мячеславович

Олексій Мячеславович Данілов Олексій Мячеславович Данілов 13-й Секретар Ради національної безпеки і оборони України Нині на посадіНа посаді з 3 жовтня 2019Президент Володимир ЗеленськийПрем'єр-міністр Олексій ГончарукДенис ШмигальПопередник Олександр Данилюк 6-й Голова Л

 

Wesley Merritt

George Wesley Meritt George Wesley Merritt (* 16. Juni 1834 in New York City; † 3. Dezember 1910 in Natural Bridge, Virginia) war ein US-amerikanischer Soldat und General während des Sezessionskrieges und des Spanisch-Amerikanischen Krieges. Inhaltsverzeichnis 1 Ausbildung zum Kavallerieoffizier 2 Sezessionskrieg 3 Aufstieg zum Generalmajor 4 Spanisch-Amerikanischer Krieg 5 Weblinks Ausbildung zum Kavallerieoffizier Merritt, dessen Geburtsdatum teilweise auch mit 16. Juni 1836 und 10. Juni...

Sporting CP no futebol internacional

Taça das Taças, o único troféu europeu conquistado pelo Sporting CP. História e estatísticas do Sporting Clube de Portugal nas competições da UEFA. Taça dos Clubes Vencedores de Taças de 1963–64 A Taça dos Vencedores de Taças de 1963–64, ou simplesmente Taça das Taças, foi vencida pelo Sporting Clube de Portugal de Portugal, que derrotou o MTK Budapest da Hungria na final. Foi a primeira e única vez que uma equipa portuguesa ganhou um troféu da Taça das Taças.[1] O Sport...

 

Football at the 1953 Arab Games

1953 Arab Gamesfootball tournamentTournament detailsHost country EgyptCityAlexandriaDates1–9 August 1953Teams6 (from 2 confederations)Venue(s)2 (in 1 host city)Final positionsChampions Egypt (1st title)Runners-up SyriaThird place LibyaFourth place JordanTournament statisticsMatches played9Goals scored56 (6.22 per match)1957 → International football competition The 1953 Arab Games football tournament was the 1st edition of the Arab Games men's fo...

 

2014 World Wrestling Championships – Men's Greco-Roman 75 kg

Men's Greco-Roman 75 kg at the 2014 World ChampionshipsVenueGymnastics Sport PalaceDates12 September 2014Competitors39 from 39 nationsMedalists  Arsen Julfalakyan   Armenia Neven Žugaj   Croatia Andy Bisek   United States Elvin Mursaliyev   Azerbaijan← 20132015 → 2014 World Wrestling ChampionshipsFreestyleGreco-RomanWomen57 kg59 kg48 kg61 kg66 kg53 kg65 kg71 kg55 kg70 kg75 kg58 kg74 kg80 kg6...

Tugu Kupu-Kupu

Tugu Kupu-KupuTugu Kupu-Kupu icon Kabupaten MarosInformasi umumJenisPatung beton dengan air mancur dan hiasan kupu-kupu yang menyala warna-warniLokasiLingkungan Solojirang II, Kelurahan Turikale, Kecamatan Turikale, Kabupaten Maros, Sulawesi Selatan, IndonesiaAlamatPerempatan Jalan H. M. Kasim, Jalan A.P. Pettarani, Jalan Jenderal Achmad Yani, dan Jalan Lanto Daeng PasewangTanggal renovasi2011[1]PemilikPemerintah Kabupaten MarosTinggi10 meter Tugu Kupu-Kupu adalah sebuah tugu atau mon...

 

Royal Canadian Air Farce (TV series)

For the comedy album of the same name, see Air Farce Live (album). Canadian TV series or program Royal Canadian Air FarceDirected byPerry RosemondStarringPresent :Roger AbbottDon FergusonLuba GoyJessica HolmesCraig LauzonAlan ParkPenelope CorrinSee also: Cast historyCountry of originCanadaNo. of seasons16No. of episodes335ProductionProduction locationsCanadian Broadcasting CentreToronto, OntarioRunning time22–23 MinutesOriginal releaseNetworkCBC TelevisionReleaseOctober 8, 1993...

 

USCGC Aurora

History United States Coast Guard NameUSCGC Aurora NamesakeAurora BuilderBath Iron Works Laid downJanuary 1931 Launched28 November 1931 CommissionedDecember 1931 Decommissioned17 January 1960 IdentificationWPC-103 Honours andawards Armed Forces Expeditionary Medal FateSold, 16 December 1968 General characteristics Class and typeThetis-class patrol boat[1] Displacement 337 long tons (342 t) (1933) 350 long tons (360 t) (1945) Length165 ft (50 m) Beam25 ft ...

Ardasyir I

Ardasyir ISyahansyah dari EransyahrWajah Ardashir I dalam koin Kekaisaran Sasaniyah.Berkuasa224–242 ADPenerusSyapur IKelahiran180 ADTiruda, Estakhr, Pars[1]KematianFebruari 242 AD[2](usia 62)WangsaSasaniyahAyahPapakIbuRodhak Ardasyir I atau Ardesyir I (Persia Tengah:

 

The Daily Telegraph (Sydney)

Australian daily tabloid newspaper This article is about the Australian newspaper. For the British newspaper, see The Daily Telegraph. For other uses, see The Telegraph (disambiguation). The Daily TelegraphCover of The Daily Telegraph (26 May 2016), occupied by a story on David Feeney, during the 2016 federal election campaign.TypeDaily newspaperFormatTabloidOwner(s)Nationwide News (News Corp Australia)EditorBen EnglishFounded 1879 (as The Daily Telegraph) 1990 (merger with The Daily Mirror a...

 

Jens Frølich Tandberg

20th-century Norwegian bishop The Right ReverendJens Frølich TandbergBishop of OsloPrimate of the church of NorwayChurchChurch of NorwayIn office1912–1922PredecessorAnton Christian BangSuccessorJohan P. LundePersonal detailsBorn(1852-05-13)May 13, 1852Hausvik, NorwayDiedMarch 21, 1922(1922-03-21) (aged 69)ChristianiaNationalityNorwegian Jens Frølich Tandberg (May 13, 1852 – March 21, 1922) was the bishop of Oslo from 1912 to 1922.[1] Tandberg was born in Hausvik, Norwa...

Banjarnegara, Banjarnegara

Untuk tempat lain yang bernama sama, lihat Banjarnegara (disambiguasi). BanjarnegaraKecamatanPeta lokasi Kecamatan BanjarnegaraNegara IndonesiaProvinsiJawa TengahKabupatenBanjarnegaraPemerintahan • Camat-Luas • Total37,56 km2 (14,50 sq mi)Populasi (2021)[1] • Total70.472 jiwa • Kepadatan1.876/km2 (4,860/sq mi)Kode Kemendagri33.04.06 Desa/kelurahan9 kelurahan4 desa Banjarnegara (Jawa: ꦧꦚ꧀ꦗꦂꦤ...

 

Mantrik

Hindu Magic Kapala used by mantrik A Mantrik or mantric is someone who specializes in practicing mantra.[1] In the Indian subcontinent, the word mantrik & similar names are synonymous with magician in different languages. Generally, a mantrik is supposed to derive his powers from the use of charms, mantras, spells and other methods. A Hindu mantrik is known to worship Kali and is often mentioned in the same breath as tantric, though there are subtle differences. A mantrik is one w...

 

Synology

Taiwanese N

Iran at the Asian Games

Sporting event delegationIran at theAsian GamesIOC codeIRINOCNational Olympic Committee of the Islamic Republic of IranMedalsRanked 4th Gold 192 Silver 202 Bronze 217 Total 611 Summer appearances1951195419581962196619701974197819821986199019941998200220062010201420182022Winter appearances1990199619992003200720112017 Iran first participated at the Asian Games in 1951, and has sent athletes to compete in every Asian Games since then, except for 1954, 1962 and 1978.[1][2] The Nat...

 

Cleavage (breasts)

Separation between human breasts A woman's cleavage Cleavage is the narrow depression or hollow between the breasts of a woman. The superior portion of cleavage may be accentuated by clothing such as a low-cut neckline that exposes the division, and often the term is used to describe the low neckline itself, instead of the term décolletage. Joseph Breen, head of the U.S. film industry's Production Code Administration, coined the term in its current meaning when evaluating the 1943 film The O...

 

Alexander Yakubovsky

Russian politician In this name that follows Eastern Slavic naming conventions, the patronymic is Vladimirovich and the family name is Yakubovsky. Alexander YakubovskyАлександр ЯкубовскийDeputy of the 8th State DumaIncumbentAssumed office 19 September 2021Deputy of the 7th State DumaIn office5 October 2016 – 12 October 2021 Personal detailsBorn (1985-05-07) 7 May 1985 (age 38)Irkutsk, Russian Soviet Federative Socialist Republic, USSRPolitical partyU...

Sunny Skies (film)

1930 film Sunny SkiesDirected byNorman TaurogWritten byGeorge ClevelandStory byA. P. YoungerProduced byPhil GoldstoneStarringBenny RubinMarceline Day Marjorie KaneCinematographyArthur ReevesEdited byClarence KolsterMusic byAl ShortProductioncompanyTiffany PicturesDistributed byTiffany PicturesRelease dateMay 18, 1930Running time73 minutesCountryUnited StatesLanguageEnglish Sunny Skies is a 1930 American Pre-Code musical comedy film directed by Norman Taurog, starring Benny Rubin and Marceline...

 

On the Beach at Night Alone

On the Beach at Night AlonePoster filmSutradara Hong Sang-soo ProduserDitulis oleh Hong Sang-soo PemeranKim Min-heeTanggal rilis Februari 2017 (2017-02) (Berlin) Negara Korea Selatan Bahasa Korea On the Beach at Night Alone (bahasa Korea: Bamui haebyun-eoseo honja) adalah film Korea Selatan produksi tahun 2017 bergenre drama yang disutradarai dan sekaligus ditulis skenarionya oleh Hong Sang-soo. Film ini terpilih sebagai salah satu peserta dalam Golden Bear perhelatan 67th Berlin...

 

Strategi Solo vs Squad di Free Fire: Cara Menang Mudah!