In short, if there is only one person with 1497 karma, (and statistically, given the number of users and amount of karma, most users will have a unique amount of karma) then the karma rating on each blog post will link them to each other. Over many posts, any clues will add up.
So sort users by karma, and only share the decile. So you would know that between 10% and 20% of less wrong users have higher karma. (Or just allow all people with at least X karma to post anonymous posts) Also, use karma at the time of posting. If a whole lot of posts suddenly bump up a rank at the same time, that strongly indicates that they are by the same person.
I have a few more suggestions here.
In short, if there is only one person with 1497 karma, (and statistically, given the number of users and amount of karma, most users will have a unique amount of karma) then the karma rating on each blog post will link them to each other. Over many posts, any clues will add up.
So sort users by karma, and only share the decile. So you would know that between 10% and 20% of less wrong users have higher karma. (Or just allow all people with at least X karma to post anonymous posts) Also, use karma at the time of posting. If a whole lot of posts suddenly bump up a rank at the same time, that strongly indicates that they are by the same person.