Wattpad - Wattpad is now the worlds most popular ebook community where readers and writers discover, share...
Poemix - Remix your text into poetry
Booksie.com - Booksie is a free online publishing site that allows writers to easily post, share, and promote their writing.
HaikuJAM - Create collaborative poetry with friends or strangers
Storybird - Visual storytelling community
Fanfiction.net - The most popular fan fiction website in the world according to Wikipedia