Comment by costco
3 years ago
Say you see user2 listed in bold on user1's page. That means that user1 is also in user2's top 20 users. In my experience it is often an indicator of a good match (but not always). I should probably explain that on the site.
Instead of making it binary, you could use a gradient indicating the strength of the mutual correlation (like how HN colors downvoted comments).