Comment by mrharrison

-1 or the thumbs down reaction, I think is a mistake. They aren't usually that constructive, because most of the time they are used as retaliation against a specific user, instead of constructive criticism. If someone downvotes you, you tend to downvote them. At the least, it should be a privilege to down vote, like SO and HN do. http://stackoverflow.com/help/privileges/vote-down