When a Page joins a group there could be several admins of that Page. All of them can see and interact with posts and members of the group.
If an admin of the group has added a third-party app, the app has access to posts and comments in the group. Third-party apps can’t access who wrote posts and comments unless the app has been given permission by the author.
Select rights owners may be able to search sale group posts, including sale posts listed in private groups, to prevent the misuse of intellectual property on Facebook.
Facebook may review group content (including private groups) to maintain the integrity of our products, promote safety and security on and off of our products, and to improve our products and services, and as otherwise described in the data policy.
