Emanuele Feronato writes: "Here we go with another step in the integration of Facebook Instant Games API in your Phaser game. In first step we covered the bare bones of Facebook Instant Games API integration. In second step we displayed player name and profile picture. In third step we saved relevant game information such as the personal best score.
Now it’s time to create and manage leaderboards.
First, you have to create a new leaderboard in your Instant Games -> Leaderboards page"