Velorth

The issue is caused by legacy ```WWW``` class in Unity 2021. Upgrade to ```UnityWebRequest``` fixes the problem.

@JustKoTMurchik, you need to patch ```AsyncRequestString.Start()``` method and ```GraphResult``` class. I'll try to create pull request soon.

@farahjr, dev branch looks a little bit outdated and it is not compatible with examples in master branch. So there isn't any public class in FB.Mobile and Graph API version...

@kerembaydogan, conditional compilation is not an option because there are lots of users that use Facebook SDK as a pre-built binary package. According to the Unity docs UnityWebRequest was introduced...