ACTIFAN

-- Joe Siclari:

Someone who participates actively in fandom (club, con, or zine) by making things happen which other, lazier, types (passifans) are content to just appreciate (and/or pay money for).

-- Dr Gafia's Fan Terms:

Short for "ACTIve FAN". Implied activity in fanzine fandom and usually at least one other area (conventions or clubs initially but now includes the internet) of the microcosm.