- AllExperts
 - Ask questions according to the category of interest and receive answers from experts. - AnswerBank, The
- Post questions and answers or discuss a wide range of interesting topics.
- Ask A Reporter
- Submit questions and get answers from different reporters from the New York Times.
- Ask an Expert Sources
- Links to experts in K-12 curricular related topics.
- Ask Mike on Yahoo! Answers
- You provide questions, Mike provides answers. Formerly known as Ask Yahoo!, Mike answers your burning (and non-burning) questions.
- Ask the Experts
- Part of the My Virtual Reference Desk collection; provides links to a variety of experts in different fields.
- Ask Yahoo! (2133)
- Get answers to your questions on Ask Mike, the Q&A column on Yahoo! Answers. Browse the archive of questions submitted to the Ask Yahoo! experts.
- AskForFree.com
- Advice given by email to specific questions in a variety of categories.
- Askme All
- Offering expert advice on a broad range of topics.
- BitWine
- Get straightforward advice, instructional guidance, or a second opinion.
- Captive.com: Ask The Expert
- Expert answers on business risk and insurance topics such as accounting, insurance consulting, and risk management.
- Experts Exchange
- Thousands of experts answer technical questions, which are posted on site by subject area. Focus is on computer queries.
- HubPages
- Share knowledge (tips, advice, reviews, insights, and opinions) with the world by creating web articles organised by topic.
- I Want Your Answers.com
- Allows users to ask experts questions on a large range of topics and get answers in real time.
- Infography, The
- Online reference tool enabling students, librarians, and teachers to identify superlative sources of information about a range of subjects. Published by Fields of Knowledge.
- 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.
- QuestionPoint
- Collaborative reference service from the Library of Congress and OCLC.
- Squidoo
- Find a lens or build a lens - everyone's an expert on something.
- Straight Dope, The
- Fighting ignorance since 1973 with answers to intriguing questions.
- The Linguist List: Ask a Linguist
- Online forum where anyone interested in language or linguistics can ask a question and get the response from a panel of professional linguists.
- Two Things, The
- For every subject, there are really only two things you really need to know. Everything else is the application of those two things, or just not important.
- WikiHow
- Collaborative effort to build the world's largest how-to manual, with user-written and edited articles offering solutions to the problems of everyday life. Browse for DIY advice, or contribute your own know-how.
- Wondir Foundation
- An information service that aims to build an open-source infrastructure. Their goal is to organise and enable the sharing of answers from FAQs, the deep web, online expert programmes, and other Internet resources.
- Yahoo! Kids: Ask Earl
- Answering questions from kids around the world.
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