About Fanlistings:
"A fanlisting is a place for all fans of a particular show, movie, actor, actress, singer, etc. to come together and build the biggest listing of people from all around the world who are fans of that subject."
- from tfl.org
About Doujinshi:
Doujinshi are fan drawn and produced manga. They are usually (but not always!) based on existing anime or manga series. They're visual fanfiction, if you will. Doujinshi are, for the most part, unauthorized by the Japanese companies and/or authors that own the copyrights to the characters and series, but most of the companies pretty much turn a blind eye to them.
"A fanlisting is a place for all fans of a particular show, movie, actor, actress, singer, etc. to come together and build the biggest listing of people from all around the world who are fans of that subject."
- from tfl.org
About Doujinshi:
Doujinshi are fan drawn and produced manga. They are usually (but not always!) based on existing anime or manga series. They're visual fanfiction, if you will. Doujinshi are, for the most part, unauthorized by the Japanese companies and/or authors that own the copyrights to the characters and series, but most of the companies pretty much turn a blind eye to them.

