We can make friends with 300 people. I encourage you to make friends with fellow ELFs (you can see their idols on profiles).
A. Use this to search for other id's so you can add them to be your friends
B. Use this to get hearts from your friends
C. Use this to share hearts with your friends (in a day we can share 3 hearts / friends)
Please make sure you will share 3 heart everyday. And better for us to share our heart as soon as possible because we have different time.