HQ - HQ is the wildly popular live game app where you can win real cash prizes.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
QuizUp - QuizUp gives you the opportunity to test your trivia skills against friends and strangers throughout the world.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
tbh - The only anonymous app with positive vibes
AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI