Get a coffee, give a coffee API

Posted to Data Sources  |  Tags: , ,  |  Nathan Yau

Jonathan Stark, a mobile application consultant, is running an interesting social experiment with his Starbucks card:

Jonathan’s Card is an experiment in social sharing of physical goods using digital currency on mobile phones. I stumbled on the idea while doing research for a blog post about Broadcasting Mobile Currency.

Based on the similarity to the “take a penny, leave a penny” trays at convenience stores in the US, I’ve adopted a similar “get a coffee, give a coffee” terminology for Jonathan’s Card.

Simply save the picture of Jonathan’s Starbucks card onto your smartphone and use it to buy your coffee. If you like, add money to the card so that someone else can buy a coffee.

The best part is that Stark provides a simple API that returns the balance on the card every minute. When do people buy coffee? How do people give and take? Are people more likely to give when there’s a large balance or when there’s nothing left? Lots of fun things to look at.

[Jonathan’s Card via @kn0thing]

Favorites

Life expectancy changes

The data goes back to 1960 and up to the most current estimates for 2009. Each line represents a country.

The Most Unisex Names in US History

Moving on from the most trendy names in US history, let’s look at the most unisex ones. Some names have …

The Best Data Visualization Projects of 2011

I almost didn’t make a best-of list this year, but as I clicked through the year’s post, it was hard …

Marrying Age

People get married at various ages, but there are definite trends that vary across demographic groups. What do these trends look like?