my favorite example is the generational difference of use of period and ellipses in sms/text messages. even just

> ok

vs

>ok.

or even (gasp)

> ok...

all have massively different tone, but if it was my parent or grandparent reading them, they'd probably be interpreted relatively the same.

my partner are our friends all enjoy having entire conversations as well by only using meme gifs. it's amazingly effective, and funny as hell. I also like using several emoji to describe the changes when I'm approving a PR that doesn't need a comment. hieroglyphics are definitely making a comeback, personally I'm there for it.