As an English major who is simultaneously trudging towards a degree in a business field, I am afraid to say that human spam is not only a sad component of my daily life, but something I look at with such melancholic indifference that may only be earned by witnessing it in the most frequent and extreme measures.
By all means, there is nothing wrong with promoting yourself, but far too many people over at Sirrine Hall are all too willing to be their own greatest cheerleader without even having an inkling of exactly what they're cheering for--I think this is exactly what Austin Kleon means in this section of the book.
Contrary to the popular belief evident in the actions of many of my peers, promoting yourself--while important--is not your job. If you do work well enough, and put it in the right places at the right times, eventually good will come of it. If you focus on putting your work everywhere all the time, you're going to have spent far too much time creating an inferior product that will be seen by far more people than you're going to want.