* Adding ability to provide own picture for facebook share dialogs
@types/facebook-js-sdk
Adding support for custom thumbnail images for using the facebook share
dialog. Facebook will provide default images for your dialog if you
don't specify your own. This allows you to override this. It works but
it isn't documented under facebook documentation unfortunately.
Adding fix for #15908 in the master repo.
* Fixing picture property to be optional
Fixing picture property to be optional as it may not always be required.
Andy Hanson