GroupsTag™ is a simple way to create Tag Lists for your Facebook groups. You can create as many Tag Lists as you want and members can add up to 50 members to each list. 

When you create a Tag List, you have to type in the name of the Tag List and you will receive a notification when anyone in the group adds a member. You will not be able to see who added a member to the group and you can see all members of the group.

GroupsTag™ will keep the member list updated so you don't have to add anyone one at a time.