As of May 20th, 2013, the “Add Members” feature (which had allowed moderators to add members to groups created prior to April 9, 2012 without their explicit consent) has been discontinued.

While we understand that moderators of older groups may feel inconvenienced by this change, it was made as an anti-spam measure for all of our members.

Moderators can continue to invite new members to join their group using the "Invite Members" feature.