Facebook Instant Game turn based matches

After experimenting with Facebook Instant Game plugin I trying to figure out how to implement turn-based matches for my game. I can access leaderboard (that only stores player scores), I can access player data (for current player only) but how I can access other players data? In order to create turn-matches I need to have access to other player's data to store the current state of other players (the round, their score etc). Do I need to store/access this data to a different back-end or I can achieve this with Facebook only?

The multiplayer plugin may be able to do what you want, but you could be better served with a database backend. Even using the multiplayer plugin you might want a dedicated host. It all depends on the scope of your requirements.

The Facebook plugin itself does not have support for multiplayer functions as far as I know.