Similarity Details shows how your interests match up with someone else's. The Details page shows everything you and another person have both rated and compares your opinions on those topics. It's an instant way to learn more about your friends, discover new interests, and view how similar or different you really are!
To compare interests, hover your cursor over the profile picture of the Luncher you want to compare with and click on the double arrow icon that pops up. The Similarity Details page shows the percentage of interests you share (Similarity Score) and lists topics that you both like, dislike, and don't see eye to eye on. Furthermore, you can see the accuracy ("Your similarity score is 48% accurate") of your Similarity Score. It's based on the number of topics you have both rated. If you don't think the Similarity Details are accurate enough, click on the "Rate More" button in the top middle of the Similarity Details page to rate more topics.