Who writes it and what do you write?

I don't write it, but my first writing (when I was seven or so) was fanfiction - even if the word didn't exist back then. I wrote my own The Five Find-Outers books, but never quite finished them. :D

My daughter likes to write fanfiction and she's got quite a popular story going here:
http://archiveofourown.org/works/11125812/chapters/24832140