Here's how to view the newest members in a group:
1. Go to your group's homepage.
2. Click the 'More Admin Tools' link.
3. Click on 'Member List' from the dropdown menu.
4. On the top of 'Member List', there is a search box.
5. To the right of the search box you will see: 'Sort List: newest | alpha | admin team | last visit | recently removed.
6. Click on 'Newest' to view the new members.