Honestly, I really liked Quora for some of its content, but the UI/UX is just simply atrocious (I have said ad nausea here on HN and other places that Quora suffers from the Digg Effect; trying to wrap their idea of UI/UX around the content too much and thus preventing users from fast, mass consumption of its content.)
I deleted my account on principle: Facebook is simply the wrong model to follow on privacy issues, and the founders of Quora, being ex-facebook have no fucking clue what is an acceptable level of privacy.
And before HNers like Wpeitri and people like Brin/Schmidt can chime in; NO you're fucking wrong. 100% transparency in every little aspect of life is NOT the future, because fuck you, that's why.
I estimate about ~500K active users on quora (pure guess) which puts the user account value quite high (which would put the account value at $800) -- and personally, if my account is that valuable, then fuck them screwing with the privacy settings on the account I make there.
I refuse to be a part of this BS, and will not go back to quora.