There aren't many.
1. Really nasty words will be tokenized, i.e. mo******cker. It worked really well for Jonny Dangerously, This feature might not work for a couple of days.
2. Posts that are long excerpts of long articles or complete personal manifestos in cascading daily series, are ok as the start of a thread, but not in the thread body to the point where it disrupts the thread.
3. You really shouldn't post whole copyrighted articles. It isn't fair to the people who worked to produce and publish them. Give 'em a link and post SOME of the article, please.
4. Try not to shoot the messenger.