Goodreads - See what your friends are reading.
PostImage.org - Provides free image upload and hosting integration for forums.
LibraryThing - A home for your books.
Pic Time - Pic Time is a versatile utility that comes with online galleries’ exclusive service with multiple tools and features.
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Stampsy - A single place to share, curate and discover visual content