Facebook Groups - Question

Hey,

I started a little action on FB that requires me to invite lots of people to a Facebook group. Is there any way to do that by USER ID or URL? I searched it but couldn't find anything.

Appreciate every piece of information.

Many thanks.

Is it possible? Even with facebook email address?

Just updating after some tests:

Facebook mail is not working anymore, not even to redirect the requests to the main email (login) of the invited person. I knew Facebook mail was a failure but had no idea it was screwed up so badly!

I will keep posting any findings about this subject to help other people as interested as myself on this matter.

Updating:

Testing something I found on another forum (seems old, but it could work). Will be posting any progress here.