Shelfari.com is a social media site that is focused on books. Members can build virtual bookshelves, discover, rate and discuss books, and participate in online groups. I joined because I thought the widget would look cool on my blog. As you know, I technically don't read books since I have a Kindle but setting up your shelf is fun and I was surprised at how many books I have/have to read. You can join by clicking on the "GET YOUR OWN SHELF."