You can invite friends by clicking the Add button underneath 'Add zookeeper' in the bottom left corner of your game window. This will open a new screen which includes a list of all your Facebook friends. Simply select who you would like to send an invitation to and click on the 'Send Zoo 2 Zookeeper request' button. Alternatively you can select friends in the friend bar at the bottom of your screen and simply click on the Add button underneath the friend you would like to send an invitation to. Once your friend has accepted your request you will be able to visit his/her zoo.
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