Soccer-1 users age 13 or older can create and join groups. Groups are simply Soccer-1 users who have self-organized. The group owner can invite other users to join the group, and kick them out if they misbehave.
Group members can communicate via a private message board. The group can also have a coach. Coaches can see additional information about the players in the group, such as their workout stats, in order to facilitate your advancement as a player.