[protomyth]

Not to be an emotionless robot, that is bad, and I really hate that too. I mean more in the communicate what you want not what you don't want. Friendly, confident, happy are good; angry, surprised, despair are not so good.

You are correct that its communication, just don't say stupid things with your face.

[drostie]

Rabbi Hillel famously is quoted as saying "Don't say anything that ought not be heard -- not even in the strictest confidence -- for ultimately it will be heard." This is one of the ways that it will be heard, heh.