A number of Web sites are there to help the newbie to get started on their exploration of Usenet without offending the natives. If your sarcasm meter doesn't work, this section of the site won't work for you, either. It's considered shouting, and will get you labeled as rude and boorish. Maybe you like being rude and boorish, but still, lay off the caps. If you're a marketing professional who thinks that this newsgroup is the perfect place to market your pet Gila monsters, think again.
Most newsgroup users react violently to spam.
Save yourself the grief. Post to the proper newsgroup. A site about Hondas doesn't want a message about Toyotas, much less a message about hot-air balloons, posted, unless it's relevant to the current discussion. Use the FAQs. Most newsgroups have a set of FAQs posted.