You need friends on this game to do many things, such as
Warning: REFERRAL CODE is not the way to add a friends!!! So, please don’t leave a comment about your code
To add a friends you need to add them from the facebook page. Once they have accepted you as a friend in the facebook, then you can start get the benefits (give and get the gift, etc).
You can only add a friend from the same server and same platform (IOS, android, or windows phone). So, please leave a comment with a format like below.
You can know what’s your server by pressing the || (pause button) on the top right of the screen. Then choose “Info” , then “ABOUT”.
If you want others add you, simply leave your facebook id on the comment. Thank you very much.