What is Grafedia?

Grafedia seems to be a new Internet trend, I wonder what is going to happen to it. If you don't know what Grafedia, here is an except from the site: "Grafedia is hyperlinked text, written by hand onto physical surfaces and linking to rich media content - images, video, sound files, and so forth. It can be written anywhere - on walls, in the streets, or on sidewalks. Grafedia can also be written in letters or postcards, on the body as tattoos, or anywhere you feel like putting it. Viewers 'click' on these grafedia hyperlinks with their cell phones by sending a message addressed to the word '@grafedia.net' to get the content behind the link."