According to the game rules, you can add friends in the game from the list of your friends on Facebook. Those from them who play the game too become your friends in it automatically.
You can also invite friends to the game. To do that, just perform a few steps:
1. Click on the button with two people depicted in the lower left side of the game window.
2. Click on the Friends button with a green "+" symbol to open the Friends menu.
3. Go to the Invite section to see the list of friends. You can also do it by clicking on the Invite friends button in the tab above the game window.
4. Choose the friends you want to invite by marking them with a tick and click on Invite selected.
5. To invite all the friends, use the Invite all option.
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