A writefag is similar to a drawfag, except with prowess in writing stories and such instead of artistic abilities.
Writefags and drawfags are similar in the fact that they both possess skill, and are sometimes admired for their skill respective skill. One can be a drawfag AND a writefag.
While drawfags have artistic abilities, writefags are great at writing stories and other literature. Some writefags are grammar nazis.