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Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming. We are an expert knowledge exchange: a place where physics researchers can ask each other about quantum entanglement, computer programmers can ask about JavaScript date formats, and photographers can share knowledge about taking great pictures in the snow.

Quora.com is a question/answer service allowing users to pose questions that other users can answer, each question and answer can have comments, each users can write one individual answer and there can be a summary answer.Each user can choose a description explaining their area of expertise or questions and answers can be anonymous.Questions and answers are searchable.

A Q&A site helps an online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast. Question2Answer is a popular Q&A solution.

Startups get your queries answered by the World's Top Investors and Entrepreneurs. Startups + Investors +Entrepreneurs Connect.

Yahoo! Answers is a way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.

Bitfortip offers a unique use case thanks to Bitcoin.

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

Curositi is a caring and supporting community of people who are eager to learn things. It provides an environment that offers opportunities to communicate new knowledge and solve problems through collaboration with experts and other members of curositi.Curositi helps individuals to engage in a meaningful inquiry based learning that has genuine value. We are encouraging individuals to invest in learning things which they truly care about and make it a habit, rather than viewing it as an activity forced upon them. »

QueryHome is a question-answer platform, which helps you to get answers of your technical problems in a social setup. QueryHome provides users to ask question in different fields like IT,sports, puzzles. provide facility to jobs and articles publishing. Registered users collect 'points' by participating, and can subsequently up- or down-vote answers by other users, leave comments and edit content in a wiki-style fashion.

Askalot is a next generation CQA (Community Question and Answer) system.

BitAsker is a paid question and answer plateform using Bitcoin ... a user can win money by answering a question.

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