| Answer Matrix | Quora | StackOverflow | TED conversations | Yahoo Answers | |
|---|---|---|---|---|---|
| Image |  |  |  |  |  |
| Website | http://www.answermatrix.com/ | http://www.quora.com | http://stackoverflow.com/ | http://www.ted.com/conversations | http://answers.yahoo.com/ |
| Description | AnswerMatrix is an online knowledge exchange community of everyday people that love sharing information. | Quora is a question and answer site focused on getting really high quality, authoritative content on any topic that people are interested in. | This is a collaboratively edited question and answer site for professional and enthusiast programmers. It's 100% free, no registration required. There are other sites for other topics, such as Photography, DIY, Cooking, Gaming etc.. See http://stackexchange.com for a full list of the current sites. | A social media platform that connects people for conversation, collaboration and debate. The platform gives people access to engage notable TED speakers, and the broader TED community, in conversations that -- for the first time on a social network -- have a time limit. | Yahoo! Answers is a place where people ask and answer questions on any topic. Why not share your facts, opinions and personal experiences with the Yahoo! Answers community? |
| Who uses the site? | Everybody | "Elite": Tech pundits, entrepreneurs, early adopters, bloggers, marketers, social media mavens. | Developers, programmers, experts and enthusiasts. Other site have experts and enthusiasts in their domain. | TED speakers and community (engaged, intellectually curious members) | Everybody |
| Topics | General topics and discussion | General topics and discussion | Technical programming issues. Issues relevant to the domain for the other sites in the network. | General topics and discussion but mainly focused on all important problems to solve around the world... | General topics and discussion |
| User reputation system | Yes Point and military rank | No | Yes scores, badges | Yes TEDCred scores, TEDCred medals, and badges | Yes points, levels, statistics |
| Related questions | No Coming soon | Yes | Yes | No | Yes |
| Related video | No | No | No | Yes Related TED Talks | No |
| Tag assignments | Yes | Yes Topic assignments | Yes | Yes | No |
| Ratings for question | No | Yes up or down | Yes vote for great conversation | Yes mark question as interesting | |
| Ratings for comments | Yes up or down | Yes | Yes up or down | Yes | Yes up |
| Summary | Yes Summary in tooltip | Yes Answers summary | Yes Summary appears at tooltip | Yes Discussion summary | No |
| Follow questions | No | Yes | Yes Via RSS feeds on each question | No | Yes private watchlist |
| Follow topics | No | Yes | Yes via RSS feeds on tags | No | No |
| Follow members | No | Yes | No People aren't the focus of the sites, the questions and answers are. | No | No |
| Post a Message to Your Followers | No | Yes | No | No | No |
| Ability to edit question (modify) | Yes Sergeant and above can modify | Yes | Yes Anybody can suggest edits (subject to approval). Users with 2K+ rep can make edits straight away. | No | No |
| Ability to suggest edits to answers | No | Yes | Yes Anybody can suggest edits (subject to approval). Users with 2K+ rep can make edits straight away. | No | No |
| Email notifications | No | Yes | Yes Tick the box at the bottom of your question. | No | No |
| Search box autocompletes | No | Yes | No | No | No |
| Saves drafts of posts | No | Yes | Yes A single draft of a question or answer is saved | No | No |
| Revert modifications | No | Yes | Yes Edits can be rolled back to any previous version by anyone with edit rights. | No | No |
| Real-time updating | No | Yes | Yes | No | No |
| Statistics | Yes Asked, views, latest activity | Yes viewed, latest activity, followers | Yes asked, viewed, latest activity | No | Yes not really.. only number of personal questions and answers |
| Volunteer moderators | Yes | No | Yes Voted on by the rest of the community | Yes | No |
| Time-boxed conversations | No | No | No | Yes Whether it's one day or one month, TED Conversations are assigned an expiration date to keep the discussion sharp and on-topic | No |
| Advertisements | No Not yet | No | Yes Reduced for users with more than 200 rep | Yes | Yes |
| Technology platform used for other sites | No | No | Yes http://stackexchange.com/ | No | No |
| Content license / Terms | Terms: do not modify the Content, put a link to Quora website to use content, keep update content with the latest version on quora. | Open data: CC-by-SA license (free to Remix, to reuse with attribution link) | Creative Commons 3.0 (Attribution-NonCommercial-NoDerivatives) license: attribute the conversation; noncommercial use only; and no derivative works. | Yahoo copyright | |
| Identity system | Answer matrix system | Facebook, Twitter | Google, Yahoo, Myopenid, Facebook, AOL, Blogger, LiveJournal, Wordpress, Verisign, Openid, ClaimID, ClickPass, Google Profile, Stackoverflow account. | TED account | Yahoo, Facebook, Google |
| Like | |||||
| Last update | 2011-09-28 17:29:55 | 2011-12-21 22:35:51 | 2011-03-06 17:53:36 | 2011-02-21 23:47:20 | 2011-02-21 23:47:20 |
2011-02-21 13:59:50 2011-12-21 22:35:51
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