I like to use Quora, because it bestows the power to the people. If a particular answer is of value, it will become popular in a short period of time, since it's voted on by the people. And if it's not, then it won't get many upvotes, and the users will see that answer as the top. On top of that, I like the ability to follow and be followed. That way I can track what the people I respect are talking about and get their insightful opinions in my feed.