In Shout you can earn points individually, but also as a group. Groups can be formed by house mates, study associations, sports associations, just a group of friends or any other group you can think of. As a group you do assignments and earn points together. This way you can save up for specific group rewards. Check the rewards page to check the current group rewards.
Update: Shout Groups are currently not available. We hope to implement this feature soon.
To create a group you first need a personal account. The account creating the group, will automatically be the admin, but you can also change that later. After creating a group you can invite other members. To add other group members later, you can send them a special PIN code for the group. As an admin, you are the only one who can order rewards with the earned group points.