While at a conference recently, a vendor was using a Twitter activated vending machine from Innovative Vending Solutions.
Each Twitter-activated vending machine incorporates a touch-screen interface to display the instructions to the consumer. The consumer is prompted to “tweet” a specific #hashtag to a dedicated @handle from their mobile device. Once the consumer tweets the @ and #, a product is immediately dispensed from the machine. Apparently, the machine utilizes a unique hashtag that is specific to the machine, so you have to be standing directly in front of the machine in order to utilize this functionality.