Freecoffee

Just by downloading a picture of this Starbucks Charge Card to your phone, you can pop in to a Starbucks and get free coffee.

Jonathan’s Card is an experiment in social sharing of physical goods using digital currency on mobile phones. Based on the similarity to the “take a penny, leave a penny” trays at convenience stores in the US, Jonathan adopted a similar “get a coffee, give a coffee” terminology.

At the time of writing this, there’s $40 on the card balance that anyone can use to pop into a Starbucks and grab a drink.

Even if this is a viral marketing trick from Starbucks, it’s very interesting– and heck, it’s free coffee!