Teams and Organizations
You can always trust as many teams and organizations as you want (and users as well). Team handles start with a "T" and organization handles start with a "O".
Creating a team
Creating teams and organizations is an upcoming payed feature. Once you are subscribed, you are the owner of your organization. You can make other users the manager of your organization. Below this organization are teams. You can make others the manager of your teams.
For the time being, you can trust other users directly.