Quora started out interesting and borderline useful. Frequently short on academic type facts but quite a bit of still useful and interesting personal experience anecdotal responses. It has since sank into a pretentious elitist leftist echo chamber where any vitriol or venom from the left is heroic, and challenging with fact from anywhere but the Bay Area Newthink party line "violates the be nice be respectful policy". It has pretty much ceased to be either useful or interesting and may even be encouraging to leftist nutcases intent on dangerous things.