RDF is a graph data model that has been around since 1997. It's a W3C standard, and it's used to power schema.org and Open Graph, among other things. Plus, there's a bunch of RDF-based graph databases ...
Dan Farber was one of the first to cover the Giant Global Graph, here on ZDNet. A few days on, though, there's value in taking a look at how these ideas are being discussed across the blogosphere. “So ...