I'm the original author of the article.

I'm not sure why this made HN 2 years after posting it, but I wanted to make a comment.

SO has implemented a way to remove the nofollow links, but it is way too strict, and probably only affects a very very very small percentage of answers. I'd bet less than 0.1%.

For example see this answer with 74 upvotes from a user with almost 100k reputation. The links are to MSDN (which is probably not spam by definition) and to a quoted source on techbubbles.com. http://stackoverflow.com/questions/2660355/net-4-0-has-a-new...