Ask.fm - Curious? Just ask! Openly or anonymously.
Flizle - Send and receive anonymous messages to friends like with Sarahah, but with the ability to reply.
Peing - Collect anonymous questions with SNS!
Kiwi.qa - Kiwi is a fast and easy way to ask your friends interesting questions and find out what they think.
Tellonym - Tellonym is the most honest place on the internet.
Zaqa - Zaqa is a Question & Answer based social networking tool.