Quora is a place for sharing, with one caveat. Anything you share that might be the slightest bit controversial, will never be seen. Quora has an unlimited amount of content, being produced daily from its users. If any post is downvoted by any other user, it will quickly become lower ranking than other answers, no matter how popular/viral it may have been. You will likely never see anything politically incorrect on Quora. This is sad because it is not an environment for innovation or constructive debate. However, it does provide plenty of good answers sometimes.
Quora has gained steadily in popularity, but in the last year, the quality of new answers available has taken a downturn. Perhaps the popularity of the site brought with it the unwanted lowest common denominator. Despite this, it's still a very viable option in Q&A websites and forums.