How do you invite people to a group on the new facebook?

Why can't I invite certain people to join a Facebook group? It says I can only invite members to my group but I've made the group Open.

• Answer:

  "Open" refers to the group's privacy settings.  This means the group's existence and all of its posts are "public".  A "closed" group is one where someone who searched could see that the group exists, but only members can see its posts.  A "secret" group is only visible to members even using search, and also of course its posts are only visible to members as well. Persons can usually be added to a group by friends who are existing members, but the group admin will be notified and can remove them.  In open and closed groups, people not already in the group may send requests to join it.  You can also send an "invitation to join group" to other users on your friend list, or to someone not on your friend list using e-mail.  An "invitation" doesn't automatically add the person to the group; rather it prompts them to send a request to join.  However, there seems to be no provision at present for anyone to add non-friends to a group directly. Hopefully somewhere in here is the answer to your question.