cross-post

vi. [Usenet; very common] To post a single article simultaneously to several
newsgroups. Distinguished from posting the article repeatedly, once to each
newsgroup, which causes people to see it multiple times (which is very bad
form). Gratuitous cross-posting without a Followup-To line directing
responses to a single followup group is frowned upon, as it tends to cause
followup articles to go to inappropriate newsgroups when people respond to
various parts of the original posting.

