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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.

Steemit gives users monetary rewards for any meaningful contribution to the platform. Of these contributions the most important are:- Creating or posting content which the other users consider valuable (like)- Finding valuable content and upvoting it

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. »

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.

Grow your audience with a custom news community. Users can signup, submit links, like them, and comment. Style the look and feel of your community to match your brand. Use any domain or subdomain you wish for your community. Free and easy.

Bitfortip offers a unique use case thanks to Bitcoin.

Coordino allows you to create a question and answer system for you and your users to enjoy.

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.

Linkibl is where you can discover and share the Internet'smost interesting content every day.

A user curated news aggregator site that focuses on high quality articles.

TopTopic is an online community where members earn revenue from their posts, comments and moderation activities. Rather than run ads, we use member up-voting (no down-voting) to both raise the exposure of content, and drive revenue to the creators.