Question2Answer - A Q&A site helps an online community to share knowledge.
Kuora - Questions and answer platform.
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Wiki Answers - Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias.
SaidIt.net - Saidit.net - say your truth.
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.