When children are young, an important part of learning language is word-play.  My sister and I used to comically mis-spell words all the time (much to my Mother’s dismay when at the store reading the shopping list).  It’s something  you outgrow usually.  For some reason, it seems to take a very long time for people to be outgrowing hugely amusing and clever mis-spellings or spelling using numbers and punctuation as well as letters.  It’s just SO clever, that it must be hard to stop.  Ok, I’m being sarcastic here.  Seeing posts with idiocy like “kewl” (cool) and other 1337 (leet) flotsam in them is incredibly tiresome.