Nintendo announced in Japan its first smartphone game. It's called Miitomo and its free-to-play. It was reported in The Wall Street Journal that Nintendo intend as a social networking game.
In Miitomo, each player makes their own Mii. Then, players are asked a set of questions and based on those answers, they communicate with other Miis and make friends. With "Tomo" refering to "friend" in Japanese, we have Miitomo!