Facebook Groups API
The Facebook Groups API is a collection of Graph API endpoints that let you read and create Facebook Group data on behalf of group members.
By installing your app on a group, a group admin can grant your app access to group content, such as posts, photos, and videos, and allow you to publish content to the group on behalf of the admin. Admins can also allow you to access publicly available information about group members who have chosen to share their public information with apps installed on the group.