Re: A Song of Ice and Fire books
I think the fanfiction mention was meant to indicate novels within the world of ASOIAF written by someone other than Martin. Shared world novels, such as the various dungeons and dragons novels or tie-ins like the Star Wars EU, are frequently referred to as "fanfiction."
'The dust dreams of the world it had once been.
But the dust, alas, does not command the wind.' - Toll the Hounds