inc. type private founded june 2009 2009 06 headquarters mountain view california area served worldwide founder s adam d angelo charlie cheever key people adam d angelo ceo slogan s the best answer to any question . website www.quora.com written in python c 1 alexa rank 93 october 9 2016 update 2 type of site question & answer registration required available in english spanish launched june 21 2010 ; 6 years ago 2010 06 21 current status active 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 . 3 users can collaborate by editing questions and suggesting edits to other users answers . 4 contents 1 history 2 operation 3 financials 4 reception 4.1 privacy concerns 4.2 long term posterity 5 top writers program 6 timeline 7 see also 8 references 9 external links history edit 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 clarification needed in december 2010 . unreliable source 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 wikipedia . 9 quora released an official iphone app on september 29 2011 followed by an android app on september 5 2012 . in september 2012 quora announced that co founder charlie cheever was stepping back from a day to day role at the firm although he would continue in an advisory role . 10 in january 2013 quora launched a blogging platform . 11 quora launched full text search of questions and answers on its website on march 20 2013 12 and extended the feature to mobile devices in late may 2013 . 13 it also announced in may 2013 that all its metrics had tripled relative to the same time in the prior year . 14 in november 2013 quora introduced a feature called stats to allow ll quora users to see summary and detailed statistics regarding how many people had viewed upvoted followed and shared their questions and answers . 15 16 techcrunch reported that although quora had no immediate plans for monetization they believed that search ads would likely be their eventual source of revenue . 17 in april 2014 it was announced that quora was raising 80 million from tiger global at a reported 900 million valuation . 18 19 20 21 quora was also one of the members of the summer 2014 y combinator batch . 22 23 24 in march 2016 quora acquired parlio . 25 in april of that year the company also began a limited rollout of advertising on the site . 26 operation edit quora requires users to register with their real names rather than an internet pseudonym screen name and visitors unwilling to log in or use cookies have had to resort to workarounds to use the site . 27 users may also log in with their google or facebook accounts 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 dustin moskovitz jimmy wales and adri n lamo . 8 28 29 30 quora has developed its own algorithm to rank answers which works similarly to google pagerank . 31 quora uses amazon elastic compute cloud technology to host the servers that run its website . 32 33 financials edit in march 2010 quora received funding of 11 million from benchmark capital valuing the start up at 86 million . 34 in may 2012 quora raised 50 million in series b funds valuing the firm at over 400 million 35 36 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 . 36 in april 2014 quora announced an 80 million series c round of funding valuing the firm at over 900 million . the funding was led by tiger global management . 18 19 20 21 reception edit quora was reviewed extensively by the media in 2010 . 37 38 39 according to robert scoble quora succeeded in combining attributes of twitter and facebook . 40 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 . 41 in 2010 d angelo and cheever were among five named smartest engineer runner up in the smartest people in the tech article by cnnmoney . 42 they were also both listed in inc. magazine s top 30 under 30 entrepreneurs list of 2011 . 43 44 privacy concerns edit in august 2012 blogger ivan kirigin pointed out that it was possible for acquaintances and followers to see his activity including which questions he had looked at . 45 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 . 46 long term posterity edit quora has attracted controversy for using robots.txt to forbid the internet archive s wayback machine from crawling the site . 47 their stated reason is that the wayback apis as of 2016 do 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 . 48 top writers program edit 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 . 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 . 49 timeline edit date event type details 000000002009 06 01 0000june 2009 product quora founded 000000002010 03 01 0000march 2010 funding quora raises 11 million in a series a with benchmark capital as an investor 50 000000002 010 06 01 0000june 2010 product quora announces that it will open up to the public 51 000000002 011 01 01 0000january 2011 team marc bodnick leaves elevation partners to join quora 52 000000002 011 02 01 0000february 2011 technology quora chooses c over c for its high performance services 53 000000002 011 07 01 0000july 2011 product quora introduces video to its q & a pages 54 000000002 011 07 01 0000july 2011 product quora introduces credits for asking to answer questions 55 000000002 011 09 01 0000september 2011 product quora introduces threaded comments and comment voting 56 000000002 012 05 01 0000may 2012 funding quora raises 50 million in a series b with peter thiel and adam d angelo as investors 50 000000002 012 09 01 0000september 2012 team co founder charlie cheever leaves 57 000000002 012 11 01 0000november 2012 product quora introduces top writers program 58 000000002 013 01 01 0000january 2013 product quora introduces blogs 11 000000002 013 03 01 0000march 2013 product quora introduces a policy eliminating image only answers . 59 000000002 014 04 01 0000april 2014 funding quora raises 80 million in a series c at 900 million valuation with tiger global management and y combinator as investors 50 60 000000002 016 01 01 0000january 2016 product quora announces bounty system offering financial bounties for the best answer selected by the user on select questions . 61 000000002 016 03 01 0000march 2016 product quora acquires parlio an online q & a site started by wael ghonim . 62 000000002 016 04 01 0000april 2016 product quora announces that it will start out testing advertisements on a small number of question pages . 63 000000002 016 05 01 0000may 2016 team marc bodnick quora s public face and leader of its business and moderation team announces that he is leaving the company . 000000002016 08 01 0000august 2016 product quora announces the support for the spanish language . 64 see also edit comparison of q & a sites references edit why did quora choose c over c for its high performance services quora . quora . retrieved february 12 2011 . quora.com site info . alexa internet . retrieved 2016 09 07 . monday june 21st 2010 2010 06 21 . quora s highly praised q & a service launches to the public and the real test begins . techcrunch.com . retrieved 2013 04 06 . cs1 maint multiple names authors list link wortham jenna march 12 2010 . facebook helps social start ups gain users . new york times . retrieved march 29 2010 . why i quit my cto job at facebook and started quora . business insider . retrieved march 29 2010 . the mystery behind quora . boston innovation . retrieved march 29 2010 . lewenstein ed . november 28 2010 . quora signups explode . retrieved january 24 2011 . a b arthur charles ; kiss jemima 5 january 2011 . quora the hottest question and answer website you ve probably never heard of . the guardian . london . retrieved 31 may 2012 . tsotsis alexia 2011 06 24 . inspired by wikipedia quora aims for relevancy with topic groups and reorganized topic pages . techcrunch.com . retrieved 2013 04 06 . cutler kim mai 2012 09 11 . quora co founder charlie cheever steps back from day to day role at the company . techcrunch . a b constine josh 2013 01 23 . quora launches blogging platform with mobile text editor to give every author a built in audience . techcrunch . retrieved 2013 02 01 . russell jon 2013 03 21 . quora finally introduces full text search to boost content discovery . the next web . retrieved 2013 11 14 . constine josh 2013 05 29 . quora brings full text search to mobile to unlock faq & as for any keyword . techcrunch . retrieved 2013 11 14 . tsotsis alexia 2013 05 28 . quora grew more than 3x across all metrics in the past year . retrieved 2013 11 14 . gannes liz 2013 11 12 . quora gives its writers a stats dashboard . allthingsd . retrieved 2013 11 14 . truong alice 2013 11 12 . quora stats tells you if people find your posts useful . fast company . retrieved 2013 11 14 . constine josh 2013 11 13 . quora signals it s favoring search ads for eventual monetization launches author stats tool . techcrunch . retrieved 2013 11 14 . a b constine josh april 9 2014 . quora wants to stay independent raises 80m series c from tiger global at 900m valuation . techcrunch . retrieved may 11 2014 . a b konrad alex may 9 2014 . quora raises 80 million from tiger global to stay independent forever . forbes . retrieved may 11 2014 . a b mcbride sarah april 9 2014 . tiger global helps q & a