Quora, Inc.
Quora logo 2015.svg
Type of business Private
Type of site
Question & answer
Available in English, French, German, Japanese, Spanish, Italian
Founded June 2009; 8 years ago (2009-06)
Headquarters Mountain View, California, U.S.
Area served Worldwide
Founder(s) Adam D'Angelo
Charlie Cheever
Key people Adam D'Angelo (CEO)
Kelly Battles (CFO)[1]
Slogan(s) The best answer to any question.
Website www.quora.com
Alexa rank Decrease 129 (Global) (December 2017)[2]
Registration Optional/required, can write and ask anonymously
Launched June 21, 2010; 7 years ago (2010-06-21)
Current status Active
Written in Python, C++[3]

Quora is a question-and-answer site where questions are asked, answered, edited, and organized by its community of users. Its publisher, Quora Inc., is based in Mountain View, California. The company was founded in June, 2009, and the website was made available to the public on June 21, 2010.[4] Users can collaborate by editing questions and suggesting edits to answers that have been submitted by other users.[5]


Quora was co-founded by Adam D'Angelo and Charlie Cheever, both former Facebook employees. It is a website where people can find answers to questions and explore complex topics in depth.

Quora's user base has grown quickly since 2010.[6] In April 2017, Quora claimed to have 190 million monthly unique visitors, up from 100 million a year earlier.[7]

In June, 2011, Quora redesigned its website to improve website navigation and usability.[8] Quora made an official iPhone app on September 29, 2011, followed by an Android app on September 5, 2012.

Google Search popularity of Quora over 5 years

In September, 2012, Quora announced that co-founder Charlie Cheever would leave his position as a co-operator of the company, though he would continue in an advisory role.[9]

In January, 2013, Quora launched a blogging platform, allowing users to post non-answer content on their profiles.[10]

Quora launched a full-text search of questions and answers on its website on March 20, 2013,[11] and extended the feature to mobile devices in late May, 2013.[12] It also announced in May, 2013, that all its usage metrics had tripled relative to the same time in the prior year.[13] In November, 2013, Quora introduced a feature called Stats to allow all Quora users to see summary and detailed statistics regarding how many people had viewed, upvoted, and shared their questions and answers.[14][15]TechCrunch reported that, although Quora had no immediate plans for monetization, they believed that search ads would likely be their eventual source of revenue.[16]

In April, 2014, it was announced that Quora was raising $80 million from Tiger Global at a reported $900 million valuation.[17][18][19][20] Quora was also one of the members of the Summer 2014 Y Combinator batch.[21][22][23]

Quora acquired Parlio online community website in March, 2016.[24] In April of that year, the company also began a limited rollout of advertising on the site.[25]

In October, 2016, Quora launched a Spanish version of its website to the public.[26] Following this announcement, in early 2017, a beta version of Quora in French was announced.[27] In May, 2017, the launch of beta versions in German and Italian launched.[28] In September, 2017, a beta version in Japanese was launched.[29]

In April, 2017, Quora was reported to have received Series D funding with a valuation of $1.8 billion.[30]


Quora requires users to register with their real names rather than an Internet pseudonym (screen name);[31] although verification of names is not required, false names can be reported by the community. This was done with the ostensible intent of adding credibility to answers. Users with a certain amount of activity on the website have the option to write their answers anonymously but not by default. Visitors unwilling to log in or use cookies have had to resort to workarounds to use the site.[32] Users may also log in with their Google or Facebook accounts by using the OpenID protocol. They can upvote or downvote answers and suggest edits to extant answers provided by other users. The Quora community includes some well-known people, such as Jimmy Wales, Richard A. Muller, Barack Obama, Hillary Clinton, and Adrián Lamo.[33][34][35][36]

Quora has developed its own proprietary algorithm to rank answers, which works similarly to Google PageRank.[37] Quora uses Amazon Elastic Compute Cloud technology to host the servers that run its website.[38][39]

Currently, Quora has different ways to recommend questions to users:[40]

  • Home feed questions recommendations: In this method, each user will have a timeline that is personalized to their preferences. Quora also provides "interesting" questions that are relevant to the user's preferences. This will lead to the user either answering that question or refers another user to better answer it.
  • Daily Digest: In this method, Quora sends a daily email containing a set of questions with one answer that is deemed the best answer given certain ranking requirements.
  • Related Questions: In this method, whether the user is logged in or not, a set of questions that relates to the current questions will be recommended and displayed on the side. This will help the user navigate through the questions and find what is more relevant to their preference.
  • Ask to Answer: This feature enables the user to request another user's answer to a question that they feel is fit or better suited to answer that question.


Quora was reviewed extensively by the media in 2010.[41][42][43]

According to Robert Scoble, Quora succeeded in combining attributes of Twitter and Facebook.[44] Later, in 2011, Scoble criticized Quora for being a "horrid service for blogging" and, although a decent question and answer website, not substantially better than competitors.[45]

As of August 2017, according to Alexa, the largest user base of Quora, 36.9%, is in the United States, followed by India at 19.3%.[46]

Content moderation

Quora supports various features to moderate content posted by users. The majority of content moderation is done by the users, though staff can also intervene.

  • Upvote/Downvote - Users can rank answers based on how relevant or helpful they found the answers to be. This feature helps maintain the quality of content posted online.[47] The more upvotes an answer receives, the higher it is ranked, and it shows up on top of the searches related to the question.
  • Report Answer - Users can report plagiarism, harassment, spam, factually incorrect articles, etc. This keeps sub-standard content under check.
  • Suggest Edits - Users make suggestions to improve an article by proposing changes to it. The proposed changes are also made visible to the original author of the question or answer and can be either approved and published or rejected.

Anonymity concerns

Quora allows users to create user profiles with visible real names, photos, site use statistics etc., which users can set to private. In August 2012, blogger Ivan Kirigin pointed out that acquaintances and followers could see his activity, including which questions he had looked at.[48] In response, Quora stopped showing question views in feeds later that month. By default, Quora exposes its users' profiles, including their real names, to search engines. Users can disable this feature.[49]

In 2014, a controversy arose about Quora's policy to restrict the Internet Archive's Wayback Machine from crawling their site. Citing possible user remorse over previously posted content, the Wayback Machine was banned entirely from crawling Quora.[50] Since the beginning of the Russian military intervention in Ukraine, Quora has used by the Kremlin-controlled troll army to slander and harass users of Ukrainian nationality, often anonymously.


Quora has attracted controversy for using robots.txt to forbid the Internet Archive's Wayback Machine from crawling the site.[51] Their stated reason is that the Wayback APIs as of 2016 does not give users a way to censor answers that they may regret previously posting. Critics have raised concerns about the fate of Quora's data if the site ever goes offline and recommended Stack Overflow as an easily archived alternative.[52]

Top Writers Program

In November 2012, Quora introduced the Top Writers Program as a way to recognize individuals who had made especially valuable content contributions to the site and encourage them to continue. This has inspired both young and experienced writers. Top writers are invited to occasional events and receive gifts such as branded clothing items and books. The company believes that, by cultivating a group of core users who are particularly invested in the site, the program creates a feedback loop of user engagement.[53]



Date Event type Details
June 2009 Product Quora founded
March 2010 Funding Quora raises $11 million in a series A, with Benchmark Capital as an investor[55]
June 2010 Product Quora announces that it will open up to the public[56]
January 2011 Team Marc Bodnick leaves Elevation Partners to join Quora[57]
February 2011 Technology Quora chooses C++ over C for its high performance services[58]
July 2011 Product Quora introduces video to its Q&A pages[59]
July 2011 Product Quora introduces Credits for asking-to-answer questions[60]
September 2011 Product Quora introduces threaded comments and comment voting[61]
May 2012 Funding Quora raises $50 million in a series B, with Peter Thiel and Adam D'Angelo as investors[55]
September 2012 Team Co-founder Charlie Cheever leaves[62]
November 2012 Product Quora introduces Top Writers program[63]
January 2013 Product Quora introduces blogs[10]
March 2013 Product Quora introduces a policy eliminating image-only answers.[64]
April 2014 Funding Quora raises $80 million in a series C at a $900 million valuation, with Tiger Global Management and Y Combinator as investors[55][65]
January 2016 Product Quora announces bounty system, offering financial bounties for the best answer (selected by the question asker) on select questions.[66]
March 2016 Product Quora acquires Parlio, an online Q&A site started by Wael Ghonim.[67]
April 2016 Product Quora announces that it will start out testing advertisements, on a small number of question pages.[68]
May 2016 Team Marc Bodnick, Quora's public face and leader of its business and moderation team, announces that he is leaving the company.
August 2016 Product Quora announces support for the Spanish language.[69]
November 2016 Team Kelly Battles announced as new chief financial officer (CFO).[1][70]
April 2017 Funding Quora raises $85 million in a series D at $1.8 billion valuation, with Collaborative Fund and Y Combinator as investors[71]

See also


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  2. ^ "Quora.com Site Info". Alexa Internet. 
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  4. ^ "Quora's Highly Praised Q&A Service Launches To The Public (And The Real Test Begins)". Techcrunch.com. June 21, 2010. Retrieved 2013. 
  5. ^ Wortham, Jenna (March 12, 2010). "Facebook Helps Social Start-Ups Gain Users". New York Times. Retrieved 2010. 
  6. ^ Lewenstein, ed. (November 28, 2010). "Quora Signups Explode". Retrieved 2011. 
  7. ^ "How many people use Quora?". "Q&A app Quora valued around $1.8 billion in $85 million fundraise". 
  8. ^ Tsotsis, Alexia (June 24, 2011). "Inspired by Wikipedia, Quora aims for relevancy with topic groups and reorganized topic pages". techcrunch.com. Retrieved 2013. 
  9. ^ Cutler, Kim-Mai (September 11, 2012). "Quora Co-Founder Charlie Cheever Steps Back From Day-To-Day Role At The Company". TechCrunch. 
  10. ^ a b Constine, Josh (January 23, 2013). "Quora Launches Blogging Platform With Mobile Text Editor To Give Every Author A Built-In Audience". TechCrunch. Retrieved 2013. 
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  13. ^ Tsotsis, Alexia (May 28, 2013). "Quora Grew More Than 3X Across All Metrics In The Past Year". Retrieved 2013. 
  14. ^ Gannes, Liz (November 12, 2013). "Quora Gives Its Writers a Stats Dashboard". AllThingsD. Retrieved 2013. 
  15. ^ Truong, Alice (November 12, 2013). ""Quora Stats" Tells You If People Find Your Posts Useful". Fast Company. Retrieved 2013. 
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  17. ^ Constine, Josh (April 9, 2014). "Quora Wants To Stay Independent, Raises $80M Series C From Tiger Global At ~$900M Valuation". TechCrunch. Retrieved 2014. 
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  29. ^ "Launching a beta for Japanese - The Quora Blog - Quora". blog.quora.com. 
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  31. ^ "Quora Terms of Service". Retrieved 2017. 
  32. ^ Mlot, Stephanie (February 15, 2013). "Quora adds options for sharing with unregistered users". PC Mag. Retrieved 2016. 
  33. ^ Arthur, Charles; Kiss, Jemima (January 5, 2011). "Quora: the hottest question-and-answer website you've probably never heard of". The Guardian. London. Retrieved 2012. 
  34. ^ "Quora morphs from adolescence to hot property". linkedmediagroup.com. Retrieved 2013. 
  35. ^ Dishman, Lydia (January 4, 2011). "fastcompany.com". fastcompany.com. Retrieved 2013. 
  36. ^ Taber, Jane (October 19, 2011). "Quora offers clues as to why Justin Trudeau won't yet seek Liberal helm -- The Globe and Mail". The Globe and Mail. Toronto. 
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  38. ^ "Quora Signups". ReadWriteWeb. Retrieved 2010. 
  39. ^ Lohr, Steve (April 22, 2011). "Amazon Malfunction Raises Doubts About Cloud Computing". The New York Times. 
  40. ^ Yang, Lei; Amatriain, Xavier (2016-01-01). "Recommending the World's Knowledge: Application of Recommender Systems at Quora". Proceedings of the 10th ACM Conference on Recommender Systems. RecSys '16. New York, NY, USA: ACM: 389-389. doi:10.1145/2959100.2959128. ISBN 9781450340359. 
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  54. ^ "Quora". Crunchbase. Retrieved . 
  55. ^ a b c "Quora". Https:. Retrieved 2015. 
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  58. ^ "Why did Quora choose C++ over C for its high performance services? - Quora". Quora.com. Retrieved 2011. 
  59. ^ "Quora Adds Video To Its Q&A Pages". Techcrunch.com. Retrieved 2015. 
  60. ^ "Quora Testing User Credits For "Ask To Answer" Questions". Techcrunch.com. Retrieved 2015. 
  61. ^ "Quora Gets Threaded Comments, Comment Voting, Editing And Images". Techcrunch.com. Retrieved 2015. 
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  63. ^ "Quora Introduces A New Top Writers Program As A Hat Tip To Its Most Valuable Contributors". Fastcompany.com. Retrieved 2015. 
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  65. ^ "Quora Wants To Stay Independent, Raises $80M Series C From Tiger Global At ~$900M Valuation". Techcrunch.com. Retrieved 2015. 
  66. ^ "Quora Turns 80M Visitors Into Q&A Bounty Hunters With Knowledge Prizes". Techcrunch.com. Retrieved 2016. 
  67. ^ "Quora's first acquisition is Arab Spring instigator's Q&A site Parlio". Techcrunch.com. Retrieved 2016. 
  68. ^ "Quora begins testing ads on 'small number' of question pages". Venturebeat.com. Retrieved 2016. 
  69. ^ "Expanding Quora Beyond English Into Spanish". Retrieved 2016. 
  70. ^ "Foundation trustee to join Quora as finance officer". The Signpost. 2016-11-26. 
  71. ^ "Quora scores $85M funding as valuation doubles to $1.8B". Bizjournals.com. Retrieved 2017. 

External links

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