You have to love many of the people who write a post for the very first time. As I look through some of the posts on this forum I realize many of the posts are written by someone using their username for the first time.
A certain (general/obvious) question is asked and some people either reply or ask specifics about the question. However, the person who wrote the post is never heard from ever again.
Another peculiar coincidence I find is that those same people making the first time post are never seen again, or comment, or write anywhere else.
Troll - In Internet slang, a troll is someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as a forum, chat room, or blog, with the primary intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.