In an excerpt below, Nick Hornby argues that a person's bookshelves reveal much about them, in fact, he claims, they are the 'fullest expression of self'. Somebody else is thinking along the same lines ...

ConnectViaBooks is a social networking service based on reading affinities.

In our experience, the books we read say a lot about our personality and interests. The more books we have in common with a person, the closer in personality type we are likely to be. This was the inspiration behind ConnectViaBooks, which allows people to find others who have read the same books and share their experiences. The time you most want to talk about a book is when you've just put it down. ... [aboutCvB]

There is a note on the site that it is developed in association with Amazon.com, and it claims to have access to a database of 50M books.

ConnectViaBooks spotted in Amazon Web Services Blog.