But in RL communication is also based on other things like body language, the eyes. There's the carnal presence of the other.

Letters are a bit different because once you've sent the letter, your own reflection is lost to you, unlike an online post.

Anyway I didn't really mean to ponder the matter of communication, and the fact you can never reach what's happening in someone's else mind, but I probably didn't express myself clearly enough to make my point. I was simply playing on the idea of a hall of mirrors...