SO has been around for far longer than Quora has, and most "experts" who post there are actual experts. I also have the feeling that the more "serious" types of

SO has been around for far longer than Quora has, and most "experts" who post there are actual experts. I also have the feeling that the more "serious" types of people would like to keep SO as a reliable source of advice, and so with against any trend that may compromise the integrity of the answers (including posters not taking things seriously).