Here is some of the information presented at my panel on fan fiction from Otakon Vegas.

Fanfiction community publishing websites:

1. Archive of Our Own (AO3) the best that’s out there, also look up the parent organization, Organization for Transformative Works, they have a great amount of resources there.
2. Fanfiction.net – the oldest, and with the best international fan base. (Beware of purgings.)
3. Live Journal, Deviant Art. (Beware of purgings.)
4. Tumblr – in my opinion, works better for graphic exchange than text exchange, but still worth a mention here.
5. Wattpad- a good resource for publishing original fic. They recently branched into fanfiction as well.

Fan Fiction professional publishing websites:

1. Amazon: Kindle Worlds (beware of exclusivity contract)
2. Outlier Digital  (read about it here: http://www.digitalbookworld.com/2013/kindle-worlds-has-first-imitator-outlier-digital-from-twilight-producers/)