Ask.fm - Curious? Just ask! Openly or anonymously.
Chancetime - Interviews in front of the world
Peing - Collect anonymous questions with SNS!
Yastalk - Receive honest feedbacks from your co-workers, friends or knowns
Tellonym - Tellonym is the most honest place on the internet.
Whisper.sh - Whisper is the best place to express yourself online. Connect with likeminded individuals and discover the unseen world around you.