The book I'm reading now is told through a variety of genres (diaries, personal and professional emails, journals) and I just find it so interesting how slang words and abbreviations came about. Who was the first person to write "BRB" in, what I'm guessing was, an IM conversation? How long did it take the first person who read LOL to figure out what it meant? And did the first recipient of "b4" think it was some clue to where the treasure trove was hidden on a pirate's map?
And yet, here we are publishing texts with these in them. While it has its time and place (and NOT in an English paper or anything else of any professionalism), I do think it's pretty cool that editors will allow it since it offers a realistic view into how we communicate.