DG is a project of SIEMENS CT, Ars Electronica Futurelab and the Johannes Kepler University Linz. The idea is very similar to STAMPS, except that they are not particularly using a map methapor. I particularly like their user scenario:
Say, for example, that you’ve arranged to meet a friend for a stroll round town. While on your way you can simply leave a digital graffito, for instance at the arranged meeting point: “Just looking at a few CDs in the store opposite, come and join me.” If you wanted to send your friends the same message by SMS you would have to send every single one a separate message. This would be far more time-consuming. Advertising messages could be placed in front of stores to draw attention to special offers. Anyone in the mood for shopping could switch on the advertising mode and wander from one offer to the next. People in a hurry simply switch this mode off.
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