Fanfiction.net - The most popular fan fiction website in the world according to Wikipedia
Wattpad - Wattpad is now the worlds most popular ebook community where readers and writers discover, share...
Belletristica - Your online writing platform. Share your stories and poetry with the world and become part of our community!
Commaful - Largest multimedia fiction site in the world. A lot of short stories, poetry, and fanfiction.
Booksie.com - Booksie is a free online publishing site that allows writers to easily post, share, and promote their writing.
BlankPage.io - Helps writers become authors.