I'm mad at my friends for playing a game without me
Why did they play the game without you?
My friends didnt call me on time.
It's expected that you will be upset if your friend excluded you from playing a game. You should call him and tell him how you feel because if you bottle up your anger it will not be good for your mental health.
I want to post on his facebook to try to convince him that he should call me. Maybe take away some of his online points or play his game world. Maybe i'll do this on my social media account, thinking of how to hurt him.
It's normal to feel bad when you're excluded by friends. But trying to hurt your friends as a result doesn't make sense. Because it will make them want to be around you less, not more.