Goodreads - See what your friends are reading.
Postly - Turn your photos into REAL beautiful postcards. Available on iPhone, iPad and Android. Make friends and family smile with a postcard!
LibraryThing - A home for your books.
Sutle - Save and organize resources into a directed learning path.
On Deck - Business Loans | Small Business Funding | OnDeck
LearnAwesome - Humanity's universal learning map