From the documentation about upgrading SDK:
The Facebook SDK is now auto initialized on Application start. If you
are using the Facebook SDK in the main process and don’t need a
callback on SDK initialization completion you can now remove calls to
FacebookSDK.sdkInitialize. If you do need a callback, you should
manually invoke the callback in your code.
Refer to: https://developers.facebook.com/docs/android/upgrading-4x
UPDATE
In SDK 4.22 the title, description, caption and image field of FBSDKShareLinkContent are deprecated. Consider removing them from usage.