The Graph API is a simple, consistent view of the Facebook social graph, that uniformly represents objects in the graph and may include people, photos, events, and pages etc., the connections between them, friend relationships, shared content, and more. Public information can be accessed without a developer key/application key, but is required for private data access. Facebook Developers enables you to build, grow and monetize amazing applications.
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Facebook’s photo tagging suggestion feature automatically recognises friends’ faces in a photo to make it fast and easy to tag people you know on the platform. In this tutorial, Narendra Rajput deconstructed the process to see how it works, then wrote a small Ruby script to automate the process.