Facebook’s Open Graph Protocol
FOAF may have been around the longest, but the largest social network to date is Facebook. Facebook began life, as other social network sites did, as a world unto itself—things were in Facebook, or they weren’t. Facebook didn’t include Web pages that were outside its own network. One of the ways Facebook has addressed this was the 2010 adoption of the Open Graph Protocol (OGP), which allows it to integrate with other web sites in new ways.
The first and most obvious manifestation of the OGP is an extension of a Facebook facility called “like.” Every Facebook resource has a distinctive button on it called “like”; when a user clicks that button, that page goes into their profile as something they like. Their contacts ...
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