Hello,

Why don't you make an option to add new members also with a facebook?
In a private community it's required and it would be nice if it could be added
to the next version.

Twitter, Facebook, etc registrations.

I believe the only way you will ever be able to get a member through Facebook is for them to sign up through Facebook themselves. It's how Facebook is built.

The user has to grant access to their data, you can't do it on their behalf.