Why do I need friends?
This game gives you the option to make friends by entering the ID they used when starting the game.
Why do I want to make friends? How does that help me?
Solution 1:
Adding friends gives you tickets. You get seven for originally registering (and having them accept) a new friend. After that, you get an extra ticket for every 40 minutes they play.
Note: You can only have five friends, and I don't believe there's any punishment for unregistering a friend; theoretically, if you really wanted a lot of tickets, you could unfriend everybody, and friend other people.