Whether you created a group by mistake, or find that you no longer want it any more, you can delete any group you administer. The only catch is that you have to be the last member of the group to delete it.
- Remove all your group's members, so you're the last member.
- Hover over You, select Groups.
- Click the group you want to delete.
- Hover over Joined, select Leave Group.
- Click Leave this Group to delete it.