How to save and load score in facebook game ?

I am trying to make a facebook game in unity .But I wondering how to save and load score for this game Please show me any way to do it .It will be very helpfull

The Facebook API can do this for you. They also have a demo that has the code to do that.

Github Code for FriendSmash in unity

You’ll want to check out Assets/Scripts/GameStateManager.cs around line: 126

Facebooks Scores API

That should pretty much cover it, look over the Facebook example, there are plenty of tidbits in there to get you going using their API to do whatever it is you kids do with Facebook.