Discussion Forum Terms:

 "Lurk"

Someone who lurks in a forum only reads the posts of others and never actually posts a message himself. Some people lurk in forums for days or years before getting involved. Others are lifetime lurkers, always reading and never posting.

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