The website Shelfari combines social networking with books. You can create a virtual bookshelf and share it with your friends. It is a great way to see what your friends are reading, and to find new books that you might enjoy. And unlike MySpace or Facebook, you don't have to feel obligated to give personal information, such as your age, location, or other interests. You can simply list the books you like to read!
If you use an RSS reader, you can subscribe to a feed of all future entries tagged 'social networking'. [What is this?]