Facebook login required? Forgitaboutit. I've never had a facebook account and never will (sure, I know you maybe can use another service...but just it isn't worth my time).
Quora was started by ex-Facebook CTO / VP Eng, who previously lead "Facebook Platform", i.e. the login requirement now seen at Quora. However, most of the world moved on.
Facebook login required? Forgitaboutit. I've never had a facebook account and never will (sure, I know you maybe can use another service...but just it isn't worth my time).