2 years ago we had a discussion about signs and gestures all over the world. Some of my classmates brought some articles about showing facial expressions. We were supposed to play a role to guess the meaning of them.
We can also see many of these icons in blogs and other things.Like and so on ...
It somehow affects our emotions and when you want to talk effectively you need to know how to use your body, hand and also your face.
Understanding body language can help you to use them correctly in other countries.
You know I've heard in a country when they wand to say no they nod their head! or shaking head instead of saying yes.
I will add two posts related to this topic.