I read recently that Fanstory can be a teacher, a mentor and a motivator. I agree! It is a teacher because you get reviews for everything you write. These reviews often point out areas where you can improve your writing. There are published authors looking for writers to mentor. And it's very nice to get immediate feedback for something you write. The motivation part comes in play by being part of a community writers.
Fanstory provides an outlet for the self-doubting writer, an outlet that keeps you anonymous (if you want) so you can have the courage to post your writing. And don't worry about sharing your writing online. Your can copyright your writing at the time you post it.