You know the feeling when little things about you are being notice by someone? Like when they noticed how sweet your cologne or perfume is? When someone noticed that you bought new pair of shoes? or when you just got a new haircut. The pounding in the heart that makes you release a positive aura is a great feeling. 

The truth about how it lightens up the mood of someone you complimented makes me restore my faith in humanity. I also saw a video on Facebook when a boy complimented everyone that he saw. The smile that registered to those people is a great energy and must be released because it is powerful and contagious. 
 
So don't hesitate to compliment someone because this thing is free, plus  you will get the most precious reward on earth. The smile of the people you complimented. 

Have a great day!