Heh, we all sound like grammar nazis, of course, but I'm all for it. Surely if enough people band together we can enact a mass revolution (or should I say evolution?) and force the n00bs to start speaking like humans....
Yeah, total wishful thinking, But, yes, you're right. Abbreviations like "brb" and "lol" are okay with me when used sparingly, and among my friends I have developed a personal shorthand for our IM conversations, but it's so much easier to communicate if people are willing to right on a level above that of a third-grader.
No offense to third-graders intended; I'm just many of them could write more eloquently than some of the Gaians I've seen.