Groups will be automatically deleted when they have no members. If you have created a group, you can delete the group by removing all its members and then yourself. Appointed admins can't delete a group they didn't create unless the original creator chooses to leave it.
Facebook is one of the most popular social networking services in the world. It was launched on February 4, 2004, by Mark Zuckerberg, along with his fellow Harvard College students and roommates, Eduardo Severin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes.