"At BookCrossing, you can register any book you have on the site, and then set the book free to travel the world and find new readers.

Leave it on a park bench, at a coffee shop, at a hotel on vacation. Share it w ...

"Find a book you have read, build your book list and use it to...

• connect with others using your booklists
• make new friends - locally, globally
• search for people with a particular ...

"See what your friends are reading. Keep track of what you've read online. A better way to find good books to read!" 

"LibraryThing is an online service to help people catalog their books easily. You can access your catalog from anywhere—even on your mobile phone. Because everyone catalogs together, LibraryThing also connec ...

"Revish is a place where people share their reading experiences. You can use Revish to keep and share a list of books you're reading, write reviews of books, find recommendations from other readers, and a whol ...

"Shelfari enables our users to become part of a global community of book lovers and empowers them to share their taste in books with their peers."