To anyone who isn't one(or doesn't know about it), 'Transfan' is the abbreviated form of 'Transformers Fan'. They generally contribute to fansites such as TFWiki.net and Seibertron.com.
About myself, I am a total, hardcore Transfan. Although my first exposure was the fairly recent 2007 live-action movie, but the discovery of TFWiki.net enabled me to collect information dating back to 1984(The Transformers-Generation 1)!
As a side note, I collect Transformers action figures! Leave good deals and nice collector/fan site URLs as comments!