"Millennials destroyed the rules of written English – and created something better":
"... millennials are "breaking the constraints" of written English to "be as expressive as you can be in spoken language." This new variant of written English strives to convey what body language, and tone and volume of voice can achieve in spoken English.
Fonteyn says that on a superficial level, we can see millennials stripping anything unnecessary from their writing, like the removal of abbreviation markers in "dont," "cant," "im" and in acronyms like tf, ur, bc, idk, and lol. In a world where most of our conversations take place online, millennials are using a number of written devices to convey things that could typically only be communicated by cadence, volume, or even body language."
https://mashable.com/2018/04/02/mill.../#Mb6vaBcVzmqB