Facebook's Open Graph Protocol from a Web Developer's Perspective. Best explanation I’ve seen yet of what the Open Graph protocol actually does. Add the RDFa-inspired metadata and a Like button to a standard web page representing a place, group, product, website or one of another limited set of object types and people can “Like” it just like they might join a fan page within Facebook itself. You can then send news feed updates to all of that page’s subscribers. The bootstrapped metadata can then benefit other services as well.