Top 7 Q&A sites

Quora is a question-and-answer website where questions are created, answered, edited and organized by its community of users. Not only it allow you to post questions or read answers but it also lets you follow certain topics, people or questions which let you know the trends that you've never thought or heard of.

Yahoo! Answers (formerly known as Yahoo! Q & A) is a community-driven question-and-answer (Q&A) site or a knowledge market launched by Yahoo! on June 28, 2005 that allows users to both submit questions to be answered and answer questions asked by other users. However, the number of poorly formed questions and inaccurate answers has made the site a target of ridicule.

Answers.com is an Internet-based knowledge exchange, which includes WikiAnswers, ReferenceAnswers, VideoAnswers, and five international language Q&A communities. To answer questions, you’ll need to join this community that has more than 200 million registrants. It has resident experts ranging from surgeons to nutrition experts to Nobel prize winners.

Answerbag is a collaborative online database of FAQs, where questions are asked and answered by users. Instead of the one question—one answer model, multiple answers to a given question are presented, in descending order of user ratings.A user who has created an account can ask and answer questions, comment on answers, rate questions and answers, and suggest new categories.

Stack Overflow is a privately held website, the flagship site of the Stack Exchange Network, created in 2008 by Jeff Atwood and Joel Spolsky, as a more open alternative to earlier Q&A sites such as Experts Exchange.

It features questions and answers on a wide range of topics in computer programming. The website serves as a platform for users to ask and answer questions, and, through membership and active participation, to vote questions and answers up or down and edit questions and answers.

WikiAnswers is an ad-supported wiki-based website where users can submit and answer questions. This site allows users to post and edit questions and answers. All the questions that have an answer can be edited and improved over time. WikiAnswers.com uses an Alternates System – where every answer can have dozens of different questions that "trigger" it. When a question is similar to an existing one, they are joined as alternatives. This helps prevent duplicate entries in an effort to promote more cohesive answers. It and all corresponding domains were acquired by Answers Corporation in November 2006 to become the user-generated content (UGC) component of Answers.com. Following the acquisition, the product was renamed WikiAnswers.

Formspring was a question-and-answer-based social networking service for social conversations operated by Formspring.me, Inc. Its features are that users of the site can follow others privately. While logged in as a registered user, people can also ask questions to his or her followers from the homepage. Spring.me also asks one question per day named "Formspring Question of the Day" which is flashed in user's inbox. In January 2011, Spring.me added a smile button which acts similar to the Like button on Facebook.