Getting these errors on iOS Xcode compile with 6.2.2 of the unity SDK.:
/Assets/Facebook/Editor/iOS/FbUnityInterface.mm:569:73: 'autorelease' is unavailable: not available in automatic reference counting mode
/Assets/Facebook/Editor/iOS/FbUnityInterface.mm:670:15: No known class method for selector 'publishInstall:withHandler:'
This post says it is fixed in 6.2.2 and I am using 6.2.2.