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 neighbors' list automatically.
You can also invite your friends to the game, become neighbors and get rewards for that in the following way:
1. Click Add neighbors (icon with a green "+" symbol in the lower right corner of the game window) to see a list of friends available for inviting.
2. Select the friends you choose by check-marking them and click on Invite. To invite all at once, use the Invite all! option.
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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