Originally Posted by To one of the many AEBN pages published on Facebook

Over the next few months, Facebook will be archiving all groups created using the old groups format. When this group is archived, its wall posts, photos and discussion threads will move to the new groups format, but group members will need to be re-added.

If your old group has enough recent activity to make it a good candidate for a new group, you will see a message at the top of the group with the option to upgrade. Members of the group will see the option to ask the admin to upgrade. If you are an admin, click "Upgrade This Group" to upgrade to the new groups format. Note that it may take a few minutes or more before the content from your group is converted to the new format.

If you choose not to upgrade your group or do not see an option to do so, the group will eventually be archived. You can continue using your group after it is archived. However, since members of old groups will not migrate to archived groups, you will need to add new members.

Keep in mind that the new groups format was designed to help you share with the small groups of people in your life. If you’ve been using your old group to promote your business, we recommend you create a Page instead. Learn more about the differences between groups and Pages.

Originally Posted by FB

Groups

• Privacy: In addition to an open setting, more privacy settings are available for groups. In secret and closed groups, posts are only visible to group members.
• Audience: Group members must be approved or added by other members. When a group reaches a certain size, some features are limited. The most useful groups tend to be the ones you create with small groups of people you know.
• Communication: In groups, members receive notifications by default when any member posts in the group. Group members can participate in chats, upload photos to shared albums, collaborate on group docs, and invite all members to group events.

Depending on your needs, you can create a Page or select "Create Group" on the left side of your home page.