How to Block Facebook Friend on Mobile

Sometime, some friends do not understand the scientific logic of any scientific truth and start to misbehave. So, best is to block such facebook friends. If you have connected internet on your mobile. You have to login your facebook profile and check the friend's comment. Just press the name of your friend. Right side you will see dot button. You have to press it and then you have to press on block button. Now, your friend will unable to unscientific comments on your scientific thoughts.