What are some alternatives?
When comparing My Storybook and Fanfiction.net, you can also consider the following products
Storybird - Visual storytelling community
Storyboard That - Storyboard That is the world's best online storyboard creator.
Wattpad - Wattpad is now the worlds most popular ebook community where readers and writers discover, share...
Archive of Our Own - An Archive of Our Own, a project of the Organization for Transformative Works
Commaful - Largest multimedia fiction site in the world. A lot of short stories, poetry, and fanfiction.
Cowbird - Cowbird is a simple tool for telling stories, and a public library of human experience.