Reddit
Freemium
Reddit is an social news aggregation, web content rating, and discussion website.
Yahoo! Answers
Free
Yahoo! Answers is a community-driven question-and-answer (Q&A) website.
Quora
Free
Quora is a question-and-answer site where questions are asked, answered, edited and organized by its community of users.
Compare Super User with alternatives
Compare Yahoo! Answers and Super User and decide which is most suitable for you.