rec.arts.sf.written - join
Discussion of written science fiction and fantasy.
High activity, 3110 subscribers, Usenet

rec.arts.sf.fandom - join
Discussions of SF fan activities.
High activity, 526 subscribers, Usenet

alt.history.future - join
See also alt.yesterday.tomorrow.
Low activity, 200 subscribers, Usenet

alt.fiction.original - join
Original net.fiction by Original Authors
Medium activity, 486 subscribers, Usenet

rec.arts.sf.science - join
Real and speculative aspects of SF science.
Medium activity, 606 subscribers, Usenet

misc.writing - join
Discussion of writing in all of its forms.
High activity, 1592 subscribers, Usenet

rec.arts.sf.reviews - join
Reviews of science fiction/fantasy/horror works. (Moderated)
Low activity, 120 subscribers, Usenet

alt.writing - join
Low activity, 488 subscribers, Usenet

alt.creative.writing - join
Low activity, 365 subscribers, Usenet

rec.arts.sf.misc - join
Science fiction lovers' newsgroup.
Low activity, 132 subscribers, Usenet