Overall, this article is of pretty low quality. Poor spelling, poor grammar, and near-zero insight. Also, the content is somewhat inaccurate. I don't read Digg any more, so I can't speak to the accuracy of its summary, but I still do use reddit, and I have to say that the list is missing at least two popular reddit topics: hating Israel and hating police. And hating Digg very rarely comes up.
I'm not really sure who the target audience of this article is, but I can't imagine that it's HN.