However it is of a significantly older generation (IIRC) that developed the shortened versions (though possibly as it was gentler age WTF might not have existed) of various text, ie those that used the Telex or TWX machines, starting back in the 1920"s. Baud cost money those days and you did what you needed to do to shorten safely a message.
I was under the impression that it started in the Titanic days - Marconi and the Morse code, speeding up coms.
Of course, before the penny post, when the recipient had to pay, some people put cryptic messages on the outside of their letter. The recipient saw it, read it, then refused to pay to recieve the letter. That's why they invented "sender pays" post.