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