Q&A Sites to Answer Your Questions
Stack Exchange Explained
https://www.youtube.com/watch?v=mbfbzKquYYI
How to Use Quora
https://www.youtube.com/watch?v=W9tIgfCN6F0
The Co-Founders of Quora have a conversation with John Battelle
https://www.youtube.com/watch?v=FqilSWYoIYw
What is it like to work at Quora?