I know I’m late to the party, BUT:
Walls of text not only smack of laziness on the part of the writing, it also shows his lack of respect for his readers. Each missive is your presentation to the community. You are standing up in the town hall and pleading your case to the populace.
The more proper whitespace you put in your posts the more people will read it. If your points are salient and cogent all the better. Using no line spacing and text message short cuts will surely limit your audience, and thus your reach. And to the people who do actually read your posts, they will come out with a negative feeling right off the bat.
Not every post has to be Hemingway or Dickens. But if you are trying to make a serious point, write seriously. And people will take you seriously.