Coin

Bird Coins are new collectible coins that can be used to buy cool stuff like power-ups, Mighty Eagles, and Wingmen in Angry Birds Friends and upgrade your cars in Angry Birds GO! You can also buy Avatar items. They are similar to the credits from the Facebook version of Angry Birds Star Wars.

Angry Birds Friends
When you start the game for the first time after the release of the Bird Coins, you get a text box telling you about them, and you can also get  440, but only once. You can earn more for free by earning stars in Weekly Tournaments, and completing them. When you complete a Tournament Level, you will get  2 for ,  4 for, and  8 for , if you get all the stars in a level, you will get  14. You can also get from daily rewards. You will get 4 in the first day,  6 in the second day in a row,  10 in the third day in a row,  16 in the fourth day in a row, and  50 in the fifth day in a row. However, streak will be restart every five days if you login every day.

Angry Birds Go!
Bird Coins are back! You can get coins from all of the races. Coins are used to upgrade your karts and are used to buy a first new kart! You can also spend coins for power-ups until the Sub-Zero update.