Most of these look like things I'd expect. However, number 13 is an obvious spam link if you look at the mentions. I wonder how HN protects against this type

Most of these look like things I'd expect. However, number 13 is an obvious spam link if you look at the mentions. I wonder how HN protects against this type of spam and how this particular spam got through. The most recent mention was 4 years ago, so it would appear this particular issue is fixed in the current software.