This plugin is a simple, easiest, and hassle free way of integrating Facebook in any of Your Unity3D Game. Game Slyce’s Facebook Plugin is based on Facebook’s Official SDK for Unity3D. We are just extending few of the many possible features of Facebook Graph API.
We are using Facebook Score API for Score Posting and Retrieving.
We have a fully-fledged working example that can easily be ported to iOS, Android and Web in the package.
We are offering full and complete source code which can really help you out in expanding the features and adding things that are not yet included in the current version of this Package. The Plugin is compatible with Untiy 4.6 and with latest versions of Unity5.
Know more about it by following the link