In reel noos, txt spk did used to have a real purpose, back in the days before phones could send multiple 'pages' of texts, you were limited to (I believe) 160 characters. So text speak evolved to be able to send longer messages in a shorter space. When phones developed, and gained the ability to split multiple messages up, sadly, text speak didn't die. Also remember, that back then you were charged per text, so sending 160 characters might cost you 20p (or whatever it was back then), if your message was longer it would cost you double, so shortening the words did actually save you money,