Just start with a club and make the first rule that you don't talk about the club.

Want to start a group? You can even be member #1, I'll be #2

The joke is that you can help the world by creating a rebel group which in turn gets added to the list.

I think the OP meant to expand the rebel groups by creating your own or expanding by join an existing one, and not snitching by expanding the list on wiki.