From documentation: At Facebook's core is the social graph; people and the connections they have to everything they care about. The Graph API presents a simple, consistent view of the Facebook social graph, uniformly representing objects in the graph (e.g., people, photos, events, and pages) and the connections between them (e.g., friend relationships, shared content, and photo tags). Public information can be accessed without a developer key/application key, but is required for private data access.
The Facebook Graph API has undergone numerous versioning updates. Launched in November 2017 and scheduled to last until at least November 2019, the newly integrated features of version 2.11 include: updates to the pages API allowing users to know what is happening to private replies, posts an commenting. Updates to group/videos permissions requiring a user access token to read videos from a group, sunsetting of app links host. All these changes are accessible in the documentation of the API.