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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.

Slant is a collaboratively edited resource that helps you quickly make decisions.

Super User, part of Stack Exchange , is a Q&A site for computer enthusiasts that's free. Free to ask questions, free to answer questions, free to read, free to index, built with plain old HTML, no fake rot13 text on the home page, no scammy google-cloaking tactics, no salespeople, no JavaScript windows dropping down in front of the answer asking for $12.95 to go away. You can register if you want to collect karma and win valuable flair that will appear next to your name, but otherwise, it's just free. And fast. Very, very fast. »

Server Fault is a Q&A site for system administrators and IT professionals that's free. Free to ask questions, free to answer questions, free to read, free to index, built with plain old HTML, no fake rot13 text on the home page, no scammy google-cloaking tactics, no salespeople, no JavaScript windows dropping down in front of the answer asking for $12.95 to go away. You can register if you want to collect karma and win valuable flair that will appear next to your name, but otherwise, it's just free. And fast. Very, very fast. »

The online market place for work. We give businesses and developers access to an on-demand scalable workforce. Workers can work at home and make money by choosing from thousands of tasks and jobs.

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

The 21 app allows you to earn bitcoin in exchange for answering messages and completing simple tasks. Companies and individuals use the 21.co web interface to send you messages and tasks, which you can complete in the 21 app. Upon answering a message or completing a task, you will receive a task reward in bitcoin! You can then cash out your bitcoin to your bitcoin wallet or Coinbase account.

OSQA is the free, open source Q&A system you've been waiting for. Your OSQA site is more than just an FAQ page, it is a full-featured Q&A community. Users earn points and badges for useful participation, and everyone in the community wins.

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.

CoinWorker lets you earn bitcoin using only your web browser.

AllAnswered.com allows any community to create question and answer boards for any topics that they are interested in. It is absolutely free to use no matter how big or small your community is. AllAnswered.com strives to be the place where people can get their questions answered and build a strong community by helping each other.

Earn bitcoin by completing tasks, answering surveys, watching videos, and more.