Definition of "fanac"

This, however, is only part of the story—just as fanzines and fan activity (Fanac) are only a part of the totality which is fandom.

1956 September, Robert Bloch, “Some of Best Fans are Friends”, in The Magazine of Fantasy and Science Fiction, volume 11, number 3, page 57

It must be emphasised that this was genuinely a 'historical' action; letter-writing to the prozines is currently a discouraged area of fanac.

1977, Brian Ash, The Visual encyclopedia of science fiction, Harmony Books, page 274

The advent of the computer and the modem means that an increasingly large number of fans indulge in most of their fanac online.

2002, Mike Resnick, Once a Fan..., Wildside Press LLC, page 274