According to the game rules, you can add friends from Facebook only. Friends from your Facebook account who also play the game are added to your list of friends automatically.
You can also invite your friends to the game and get rewards for that in the following way:
1. Click on the Friends button at the bottom menu.
2. Go to the Invite friends tab (button with two people and "+" symbol in the lower part of the window). You can also visit the tab with the help of the Invite friends button in the upper part of the game.
3. Select the friends you choose in the list by check-marking them and click on Invite. You can find a certain friend with the help of the Search neighbors field. To invite all at once, use the Select all option and then click Invite.
The amount of friends you should invite to get a reward is stated on the scale at the top of the tab. Pay attention to the timer above the list of friends - it shows the time left for inviting friends in order to get a reward!
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