In point of fact, there is always going to be somebody to complain that
no one put up a spoilers notice.
If you are posting to the Buffy group and mention that Angel is a
vampire, someone is sure to write in and say:"You should have put up a
spoilers warning. We just got basic cable here in Bellingham, Washington
and I didn't know that Angel was a vampire and you spoiled it for me and
I can never enjoy Buffy again and I hope you burn in hell you evil
spoiler you."
If you don't want to be spoiled, don't visit the newsgroup till after
you've seen the show.