Members can Create, Invite and Join Groups, you may create a Group to be Private or Public
Create or Join a Public Group to find Members with common interests, these could be photographic style, camera brand, software brand, why not arrange a photographers meet in your city etc:
Create a Private Group if you belong to a Camera or Photographic Club and are looking for somewhere online where other members can pop in for Information, you can even create private events to keep them up to date