Quora - Quora is a place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.

wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.

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.

Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.

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

AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI