formal postings

Well, after reading some of these posts, I found that most of them seem to be very formally written. Most blogs that I’ve seen are not formal. They usually use slang that wouldn’t be acceptable in professional writings. For example instead of you, people will write u. another example is instead of through, people would write thru. I guess I didn’t really see any of that here because this is a blog that deals with a classroom and is for a grade.