1) Always use add friends and use them, each friend used is ~2 energy. Refill energy with social points. Friends can be reused in 8 hours. Thats equivalent to 40*3*2 =240 free energy every day.
2) Most of us are unable to clear B2 of the two key dungeons. Use friends there to get social points when you do the simple B1 stage.
3) Keep your energy low before you level up !
