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Quora, Inc.
Type Private
Headquarters Mountain View, California
Area served Worldwide
Founder(s) Adam D'Angelo
Charlie Cheever
Key people Adam D'Angelo (CEO)
Employees 106[1]
Slogan(s) Your Best Source for Knowledge.
Website .comquora
Written in Python
Alexa rank positive decrease 252 (December 2014)[2]
Type of site Knowledge markets, Q&A software
Registration Required
Available in English
Launched June 2009
Current status Active

Quora is a [3] Quora aggregates questions and answers to topics. Users can collaborate by editing questions and suggesting edits to other users' answers.[4]


Quora was co-founded by two former Facebook employees, Adam D'Angelo and Charlie Cheever. D'Angelo resigned from his position at Facebook in January 2010 to create Quora.[5] He said that he and Cheever were inspired to create Quora because "we thought that Q & A is one of those areas on the internet where there are a lot of sites, but no one had come along and built something that was really good yet."[6] Quora's base of users grew quickly in December 2010.[7]

Quora had an estimated 500,000 registered users, as of January 2011.[8] In June 2011, Quora redesigned its website, in order to make information discovery and navigation easier. Some noted that the redesigned site had definite similarities to WorldHeritage.[9] Quora released an official iPhone app on September 29, 2011 [10] and an official Android app on September 5, 2012.[11]

In September 2012, co-founder Charlie Cheever announced that he was stepping back from a day-to-day role at the company, while continuing to retain an advisory role.[12][13] An article in Business Insider quoted an anonymous Quora answer, claimed to be written by an insider, that stated that Cheever left the company because he wanted to focus on the user experience, whereas D'Angelo wanted to focus on growth, and D'Angelo, by financing the Series B investment mostly from his own money, acquired sufficient control over the company to have things his way.[14]

In January 2013, Quora launched a blogging platform.[15]

Quora launched full text search of questions and answers on its website on March 20, 2013,[16] and extended the feature to mobile devices in late May 2013.[17] It also announced in May 2013 that all its metrics had grown 3X relative to the same time last year.[18]

On November 12, 2013, Quora introduced a feature they called Stats that they billed as a dashboard for writers. This would allow all Quora users to see summary and detailed statistics regarding how many people had viewed, upvoted, followed, and shared their questions and answers.[19][20] TechCrunch reported that, although Quora did not have any immediate plans for monetization, they believed that search ads would likely be their eventual source of monetization.[21]

In April 2014, it was announced that Quora was raising $80 million from Tiger Global at a reported $900 million valuation.[22][23][24][25] Quora was also one of the members of the Summer 2014 Y Combinator batch.[26][27][28][29]


Quora requires users to register with their real names rather than a screen name. Quora users may also log into Quora with their Google, Twitter or Facebook accounts using the OpenID technology. Quora users can upvote or downvote answers; they can also suggest edits to existing answers provided by other users. The Quora community includes some well-known people, such as Steve Case, Marc Andreessen, Dustin Moskovitz, Jimmy Wales, Michael Dell, Justin Trudeau, Stephen Fry and Ashton Kutcher.[8][30][31][32] The largest group of Quora users is located in Silicon Valley, followed by New York City.[5] Close to 40% of its users are from India as of January 2014.[33]

Quora uses the Pylons and Comet technologies for its backend and Ubuntu Linux as its operating system with MySQL as its database. It also uses Git and memcached. Quora uses Nginx as a reverse proxy server and HAProxy for load balancing. Quora has developed its own algorithm for ranking answers, which works similar to PageRank.[34] Quora uses Amazon Elastic Compute Cloud technology to host the servers that run its website.[35][36] In August 2011, Quora switched its infrastructure's Python implementation from CPython to PyPy, in order to improve response time.[37]

Unlike other question-and-answer platforms, Quora incorporates the aspect of gamification into their platform. For example, a user is rewarded credits for providing a quality answer. With these credits, users are able to individually ask and compensate experts to answer a certain question. For example, a user might use 250 credits to ask an expert (or qualified user) to answer the question. The aspect of being able to ask experts questions in exchange for credits is unique to Quora's platform.[38]

Privacy concerns

In August 2012, blogger Ivan Kirigin pointed out that it was possible for acquaintances to see his activity including which questions he had looked at.[39] In response, Quora stopped showing question views in feeds later that month.[40] By default, Quora exposes its users' profiles, including their real names, to search engines.[41]


In March 2010, Quora received funding in the amount of $11 million from Benchmark Capital, valuing the start-up at $86 million.[42] Quora's valuation was rumored to be more than $1 billion in February 2011,[43] and the privately held company possibly turned down an acquisition offer of $300 million, according to Business Insider.[44]

In May 2012, Quora raised $50 million in Series B funds, valuing the company at over $400 million,[45][46] bringing their total funding to $61 million. Co-founder D'Angelo, who owns 0.8% of Facebook stock, also invested $20 million of his own money in the B round.[46]

In April 2014, Quora announced an $80 million Series C round of funding, valuing the company at over $900 million. The funding was lead by Tiger Global Management.[22][23][24][25] D’Angelo also said the site would likely introduce its first ads in 2015.


Quora has been favorably described in articles published by The New York Times, USA Today, Time and The Daily Telegraph (UK).[47][48][49][50]

According to Robert Scoble, Quora succeeded in combining attributes of Twitter, Facebook, Google Wave and similar websites that are based on a system of users voting up content.[51] Scoble later criticized Quora for being a "horrid service for blogging," and although a decent question and answer website, not substantially better than competitors.[52] The Daily Telegraph has predicted that Quora will become larger than Twitter.[50] Quora, along with Airbnb and Dropbox, has been named among the next generation of multibillion dollar start-ups by the New York Times.[53]

In 2010, D'Angelo and Cheever were among five named "Smartest Engineer runner-up" in the "smartest people in the tech" article by CNNMoney.[54] They were also both listed in Inc. magazine's "Top 30 Under-30" entrepreneurs list of 2011.[55][56]

See also


  1. ^ "". Retrieved 2014-12-07. 
  2. ^ " Site Info".  
  3. ^ Monday, June 21st, 2010 (2010-06-21). "Quora’s Highly Praised Q&A Service Launches To The Public (And The Real Test Begins)". Retrieved 2013-04-06. 
  4. ^ Wortham, Jenna (March 12, 2010). "Facebook Helps Social Start-Ups Gain Users". New York Times. Retrieved March 29, 2010. 
  5. ^ a b "Why I Quit My CTO Job At Facebook And Started Quora". Business Insider. Retrieved March 29, 2010. 
  6. ^ "The Mystery Behind Quora". Boston Innovation. Retrieved March 29, 2010. 
  7. ^ Lewenstein, ed. (November 28, 2010). "Quora Signups Explode". Retrieved January 24, 2011. 
  8. ^ a b Arthur, Charles; Jemima Kiss (5 January 2011). "Quora: the hottest question-and-answer website you've probably never heard of". The Guardian. Retrieved 31 May 2012. 
  9. ^ Tsotsis, Alexia (2011-06-24). "Inspired by WorldHeritage, Quora aims for relevancy with topic groups and reorganized topic pages". Retrieved 2013-04-06. 
  10. ^ "Announcing Quora for iPhone and iPod touch — Gallimaufry". Quora. Retrieved 2012-02-12. 
  11. ^ "Introducing Quora for Android". Quora. Retrieved 2012-10-05. 
  12. ^ Cutler, Kim-Mai (2012-09-11). "Quora Co-Founder Charlie Cheever Steps Back From Day-To-Day Role At The Company". TechCrunch. 
  13. ^ "What is Charlie Cheever's status at Quora as of September 11th, 2012?". Quora. 
  14. ^ Carlson, Nicholas (October 2, 2012). "The Sudden, Mysterious Exit Of A Quora Cofounder Has Silicon Valley Baffled".  
  15. ^ Constine, Josh (2013-01-23). "Quora Launches Blogging Platform With Mobile Text Editor To Give Every Author A Built-In Audience".  
  16. ^ Russell, Jon (2013-03-21). "Quora finally introduces full-text search to boost content discovery".  
  17. ^ Constine, Josh (2013-05-29). "Quora Brings Full-Text Search To Mobile To Unlock FAQ&As For Any Keyword".  
  18. ^ Tsotsis, Alexia (2013-05-28). "Quora Grew More Than 3X Across All Metrics In The Past Year". Retrieved 2013-11-14. 
  19. ^ Gannes, Liz (2013-11-12). "Quora Gives Its Writers a Stats Dashboard".  
  20. ^ Truong, Alice (2013-11-12). Quora Stats" Tells You If People Find Your Posts Useful""".  
  21. ^ Constine, Josh (2013-11-13). "Quora Signals It’s Favoring Search Ads For Eventual Monetization, Launches Author Stats Tool".  
  22. ^ a b Constine, Josh (April 9, 2014). "Quora Wants To Stay Independent, Raises $80M Series C From Tiger Global At ~$900M Valuation".  
  23. ^ a b Konrad, Alex (May 9, 2014). "'"Quora Raises $80 Million From Tiger Global To 'Stay Independent Forever.  
  24. ^ a b McBride, Sarah (April 9, 2014). "Tiger Global helps Q&A site Quora raise $80 million".  
  25. ^ a b "Quora Raises $80M Led by Tiger Global, Now Valued at $900Ml". Re/code. 9 April 2014. Retrieved 11 April 2014. 
  26. ^ Constine, Josh (May 11, 2014). "Q: Why Did Quora Join Y Combinator? A: It Was Almost Free".  
  27. ^  
  28. ^  
  29. ^ Kokalitcheva, Kia (May 9, 2014). "Meet the oldest Y Combinator startup ever: Quora".  
  30. ^ "Quora morphs from adolescence to hot property". Retrieved 2013-04-06. 
  31. ^ Dishman, Lydia (2011-01-04). "". Retrieved 2013-04-06. 
  32. ^ 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). 
  33. ^ http://www.alexa.cominfo/
  34. ^ "Quora's New Algorithm for Ranking Answers". ReadWriteWeb. Retrieved March 29, 2010. 
  35. ^ "Quora Signups". ReadWriteWeb. Retrieved March 29, 2010. 
  36. ^ Lohr, Steve (April 22, 2011). "Amazon Malfunction Raises Doubts About Cloud Computing". The New York Times. 
  37. ^ Gaynor, Alex (August 12, 2011). "Quora is now running on PyPy". Quora. 
  38. ^ "Quora Credits". Retrieved 7 April 2014. 
  39. ^ "This is a bit fucked, Quora". 2012-08-13. Retrieved 2013-04-06. 
  40. ^ "Removing Feed Stories about Views". 2012-08-14. Retrieved 2013-05-30. 
  41. ^ "Quora Privacy Policy". Retrieved 7 April 2014. 
  42. ^ "Benchmark Invests at $86 Million Valuation". TechCrunch. Retrieved March 29, 2010. 
  43. ^ "Quora Investor Scoffs At $1 Billion Offer Price". Retrieved July 17, 2012. 
  44. ^ "Get Ready For A Huge Quora Round". Retrieved July 17, 2012. 
  45. ^ "Former Facebook Hands Capitalize on Buzz". Wall Street Journal. Retrieved July 17, 2012. Quora raised $50 million in a new financing that values it at $400 million, up from a valuation of around $86 million two years ago, said people familiar with the matter. The new financing round is led by Facebook board member Peter Thiel, who invested with his own personal funds , May 15, 2012
  46. ^ a b Facebook Alums Push Q&A Site Quora. Wall Street Journal. May 15, 2012. 
  47. ^ "V.C.’s Answer Yes to Quora". March 30, 2010. Retrieved March 29, 2010. 
  48. ^ Baig, Edward C. "Social-networking site Quora has answers to your questions". USA Today. Retrieved March 29, 2010. 
  49. ^ "Is Quora the Next Red-Hot Web Start-Up". Retrieved March 29, 2010. 
  50. ^ a b Yiannopoulos, Milo. "Quora will be bigger than Twitter". London: Telegraph. Retrieved March 29, 2010. 
  51. ^ "Is Quora the biggest blogging innovation in 10 years". Scobleizer. Retrieved March 29, 2010. 
  52. ^ "Why I was wrong about Quora as a blogging service...". Scobleizer. January 30, 2011. Retrieved August 9, 2011. 
  53. ^ Rusli, Evelyn M. (2012-12-13). "The New Start-Ups at Sun Valley". Retrieved 2013-04-06. 
  54. ^ "CNN 2010 Smartest People in Tech". 2010-07-09. Retrieved 2013-04-06. 
  55. ^ "Top 30 Under 30, 2011". 
  56. ^ "Honoree Profiles for C.Cheever, A.D'Angelo, Top 30 Under 30, 2011". 

External links

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