on https://developers.facebook.com/docs/games/scores/ page facebook doc says that we can use score api to generate a leaderboard.
as the application developer I can get all scores of my application when I call /app_id/scores on graph api.
a friend of mine installed my game, but he cant see my score when he calls /app_id/score, he can only see his own score.
can we show players rank and score and his friends scores also?
is it possible?
Yes, it is possible. See https://www.assetstore.unity3d.com/en/#!/content/17803 
Look into my plugin. Hope it’ll serve the purpose.
Guys come on! Stop selling your assets on all the unity forum.
I want a solution and I don’t want to buy any plugin.