Facebook Integration With Unity3D

Hi, I am working on Unity3d game console. I have faced an issue that Facebook integration in the Unity Apps/Games. Facebook integration is very common things in today apps. Now each and every app has Facebook section in it. So for the success of App now it's mandatory to app Facebook Invite and Facebook Share. I have read related info in almost all unity developer forums and I also found this platform very useful. I hope any tech developer will resolve my issue.