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Whilst you are waiting for your coffee why not leave some feedback, a poem, a picture, the first chapter of your book for the other customers to read or provide feedback on.
Do you have a special run of a bottle of wine or a new brew of beer, DZero enable the bottle labels and all of your customers can discuss their opinion, leave photos and more.
Create a DZero tag, stick it a meeting point and leave your cryptic clue for your compatriots to find and decypher. The only limit is your imagination.