- Akatoo
 - Online knowledge network where students are encouraged to post questions and answers and are rewarded with prizes for high quality knowledge. - AllExperts
- Ask questions according to the category of interest and receive answers from experts.
- Ask MetaFilter
- Discussion area for sharing knowledge among members of MetaFilter.
- AskAnything.com
- Ask or answer questions.
- Askville
- Experts community set up by the folks at Amazon.com.
- Associated Content
- Online publishing company providing an information exchange where authors can submit, users can view, and webmasters can buy audio, text, and video content.
- Big Think
- Philosophers, entrepreneurs, academics, economists, and politicians open discussions of social and political questions and concerns. People at home can respond with comments and ratings.
 BumperBrain
- Offers targeted solutions, support, information, answers, and advice.- ExpertBee
- Features rated experts in all topics who bid to answer your questions.
- Hotbully
- Hosts a global information exchange on people, products and business.
- HotDispatch
- Marketplace where people buy and sell software, technical expertise, code, or other intellectual property.
- How To Do Things
- Find step by step guides for thousands of topics. Features experts sharing knowledge with users in an easy to understand way.
- HubPages
- Share knowledge (tips, advice, reviews, insights, and opinions) with the world by creating web articles organised by topic.
- Idea Exchange
- Marketplace for buying and selling ideas.
- ImLive.com
- Presents live video chats with resident experts in a variety of topics.
- Infomarkets.com
- Connects buyers and sellers of information.
- InnoCentive
- Solicits answers to scientific problems related to drug development, with problems posted on the web site. Offers monetary rewards for viable solutions.
- IntellectExchange
- Service that connects experts in business, information technology, engineering, and science with those seeking advice and assistance.
- Just Answer
- Question and answer site allowing users to ask questions and receive answers from experts.
- Kasamba
- Connects users with experts on a wide range of subjects who can answer their questions in real-time over the web.
- Keen
- Get advice over the phone on subjects ranging from love to money, health to computers, taxes to psychic readings.
- Knexa
- Offers an arena for the buying and selling of specialised expertise and ideas.
- LazyWeb
- Bloggers can use Trackback to send questions to LazyWeb and automatically collect comments and answers to the questions they pose.
- Live Expert
- Offers live chat advice on various web-based subjects including hosting, design, and site promotion.
- LiveAdvice
- Offers a marketplace for the exchange of personal knowledge and experience.
- NowNow.com
- Information and research service by Amazon. Ask a question through email or your mobile phone and paid web surfers will search for your answer.
- Professor's House
- Features articles about children, relationships, family, computers, electronics, cooking, and caring for all aspects of your busy home.
- Programme Management Web Site
- Provides knowledge exchange for those involved in managing projects.
- QandAs.com
- Online question and answer community featuring topics in several categories.
- Sharksforum.com
- For people with IT questions and assignments.
- Soapbox.com
- Allows users to buy, publish, and sell ideas and information. From the Motley Fool.
- WebAnswers.com
- Ask and answer questions for free to a community of experts. WebAnswers advisors complete to provide the best answers to questions in return for advertising royalties.
- weRlive.com
- Online expert arena allows members to video chat with personal advisors and professionals with a broad range of specialties including education, health, foreign language, and mysticism and spirituality.
- wis.dm
- Online community where users ask questions and get back answers.
- Xerox MKMS
- Offers software for knowledge management and information monitoring.
- Yahoo! Answers
- A place where people ask each other questions on any topic, and get answers by sharing facts, opinions, and personal experiences.
- Yahoo! Answers Blog
- The official blog of Yahoo! Answers showcases and discusses interesting questions from Yahoo! Answers.
- Yahoo! UK & Ireland Answers
- Allow users to share their knowledge, experience and opinions by answering questions asked by others or find the information they want by posting questions for other people to answer.
- Yedda
- Social knowledge sharing service. Yedda enables people to benefit from the personal experience of others and helps to connect people who seek knowledge with those who possess it.
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