If you tap the Facebook button on the right side of the screen you can access the "Friends" tab of the game, from here you can connect your account to a facebook account.
If you connected your account, you can visit your Facebook friends mansions (if they play the game), just by pressing the "Visit" button.

Once you are on another player's mansion you'll be presented with the possibility to find and tap a hidden balloon that will reward you with a random kooky box!
You can also send 1 gift to each friend per day with the "Send Box" button, this will reset every 24hs.

If your friends send you kooky boxes you'll be able to see them when opening the "Friends" tab, you will see a screen similar to this:
Once you press the "Claim Gifts" button the kooky boxes will be added to your inventory.