How can I choose what groups to post in?
Pick as many as you can, so that you get the widest audience. After
all, the net exists to give you an audience. Ignore those who suggest you
should only use groups where you think the article is highly appropriate.
Pick all groups where anybody might even be slightly interested.
Always make sure followups go to all the groups. In the rare event
that you post a followup which contains something original, make sure you
expand the list of groups. Never include a “Followup-to:” line in the
header, since some people might miss part of the valuable discussion in
the fringe groups.
– Emily Postnews Answers Your Questions on Netiquette