In each FAST module the Create Public/Group Pinned Reports role allows users to create public or group pinned reports.
Public pinned reports can be viewed by any user that has access to that reporting page.
Group pinned reports can be viewed by a group of users, groups are set up by creating a specific user role for the group and assigning the role to the pinned report. Any users assigned to the group will then have access to the pinned report. Only administrators can set up groups.