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XFN puts a human face on linking. As more people have come online and begun to form social networks, services such as Technorati and Feedster have arisen in an attempt to show how the various nodes are connected. Such services are useful for discovering the mechanical connections between nodes, but they do not uncover the human relationships between the people responsible for the nodes.There's a very well-thought out explanation of why these particular values were chosen for XFN on the gmpg.org website.
if I come up with something snarkable later, though, I'll change my mind.
posted by shmegegge at 11:06 AM on February 11