This article is from the Advertising on Usenet FAQ, by Joel K. Furr firstname.lastname@example.org.
To make a long story short, off-topic advertising and advertising that
equates to a bullhorn stuck into someone's window in the middle of the
night are bad ideas.
*Please* exercise restraint and don't make the mistake many have of
thinking that just because there's no central authority that can punish
you for spamming newsgroups, that there will be no consequences if you do.
There will be consequences if you spam -- and you might be surprised by
the lengths that vengeful Usenet users can go to when someone spams their
favorite group with yet another off-topic advertisement.
If you want to advertise on Usenet, you can, but please follow the tips
contained in this document's "How to" section and don't make the mistakes
listed in "How not to do it."
Stay on topic; keep your notices hype-free; only post your notices to
newsgroups where they are appropriate.
Do unto others as you would have them do unto you.