11. The Signature Dork
The Signature Dork appends a 14-line signature to the bottom of each of his posts to the forum or comments section. The boilerplate often consists of the dork's name and titles, followed by a (lengthy) quotable quote, system specs, possibly a grocery list, more quotes (usually from Einstein or Isaac Asimov), followed by a straggling line of crappy-looking, home-made animated GIFs.
This makes a brisk back-and-forth dialogue of Twitter-length comments between the Signature Dork and anyone else look like a series of fortune-cookie fortunes interspersed with a series of fortune-cookie fortunes attached to bricks.