I ask in reference to the panel below, which I'm moderating. Note the last sentence. I have my own mental list, but would appreciate additions to it.
Fanfic as Criticism (Only More Fun)
Fanfiction is being produced online at a rate of millions of words per month. Fanfiction can expand on a shorter work, change a work's themes, or even attempt to "fix" things the author is felt to have done "wrong" (e.g., provide a backstory to explain otherwise undermotivated behavior). These dynamics are not unheard of outside of Internet fandom communities — Virginia Woolf's Mrs. Dalloway attempts to "fix" James Joyce's Ulysses (which itself retells Homer's Odyssey). In what ways can fanfiction be a valuable part of the criticism of a text? Can it appeal as criticism to readers outside the fanfiction community? If so, how can they find the most interesting works?