There are (at least) a couple fun sites for sharing your books and socializing with other readers. There’s the relatively new Goodreads where you can see what your friends are reading, find good books to read and keep track of what you have read and want to read. It’s free and fun and worth a look if you enjoy reading, discussing and discovering new books.
I See Dead People(‘s Books)
Also there’s LibraryThing, which has been around for a bit longer. Here you can do the same kinds of things, plus you can find people with similar reading interests.
Not quite as morbid as it sounds, at LibraryThing, there’s a group devoted to cataloging the collections of dead people. Wanna see what was on Tupac‘s bookshelf? Wanna know what Sylvia Plath was reading? Now you can. For a complete list of cataloged authors, including libraries in progress, visit the group I See Dead People(‘s Books) over at LibraryThing.