Yes, we’d like to do this, but it’s not a quick development job so we’ve not been able to prioritize it to date.Anonymous commented
Goodreads.com has this feature. When you click on a person's account, you can then Compare Books. It shows you a Venn Diagram...percentage of how many books you have in common and not in common, percentage of films you have both seen with a similar rating. It's great and has been a feature on their site for years.