UseNet Policy
eBay users may not post on Usenet groups (Internet newsgroups) to
advertise eBay or an eBay listing that is inappropriate or violates the
Usenet board policy. If Usenet abuse is reported to eBay, we may among
other remedies) remove the listing, issue a warning, temporarily suspend
or indefinitely suspend the offender's eBay account.

We have no tolerance for UseNet abuse and will take action as
appropriate. Please note that we can only take action in cases where it
is clear that an eBay member has posted to the Usenet inappropriately.

Usenet abuse should also be reported to your ISP (Internet Service
Provider) and the email provider of the person posting on the Usenet.
Both of these organizations are in a much better position to prevent
future Usenet abuse. Generally, you can send email to abuse@"ISP".com to
properly report perceived violations.

http://pages.ebay.com/help/usenet_policy.html