The sign that's in your email address, and everyone else's, actually got its start hundreds of years ago in monasteries. Textspeak isn't just for tweens. It's for monks.
This hopeful illustration from the December 1930 issue of Modern Mechanics predicted that future fellows and flappers would fly around in this highfalutin flivver. Look out your window. I see no half-crop-duster-half-jalopies whizzing around. Sorry, readers of 1930.