Your post reminded me how I could tell my online friend was pissed just because she typed "okay." or "K." instead of "okay". We could sense our emotional state from texting. One of those friendships you form over text through the internet. I wouldn't recommend forming these too deeply since some in person nuance is lost, we could never transition to real life friends despite living close by. But we could tell what mood we were in just from typing. It was wild.