Discussion Forum Terms:

 "Post"

A great forum post is not made of wood, but of thoughtful, well-expressed remarks that benefit the readers. The term smacks of the type of post one leaves on a physical bulletin board. A forum post is simply a message left or "posted" on an Internet bulletin board (discussion forum).

Discussion Forum Terminology
Avatar, Bump, Flame, Lurk, Post, Sig, Spam, Sticky Thread, Thread, Troll, Water Cooler