Ask.fm - Curious? Just ask! Openly or anonymously.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Tellonym - Tellonym is the most honest place on the internet.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Zaqa - Zaqa is a Question & Answer based social networking tool.
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI