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Here is a nice interactive installation from Nokia, playing on their ever increasing “Random Acts of Kindness” vision that allows anyone to simply check-in to one of the the vending machines via Foursquare to release some sort of surprise.
It’s a pretty simple setup, with the vending machine checking the Foursquare check-in count every second or two, with any increase instantly triggering the release of a Nokia canister housing everything from chocolates to new N series phones!