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

A Day in the Life of Americans

I wanted to see how daily patterns emerge at the individual level and how a person’s entire day plays out. So I simulated 1,000 of them.

Reviving the Statistical Atlas of the United States with New Data

Due to budget cuts, there is no plan for an updated atlas. So I recreated the original 1870 Atlas using today’s publicly available data.

10 Best Data Visualization Projects of 2015

These are my picks for the best of 2015. As usual, they could easily appear in a different order on a different day, and there are projects not on the list that were also excellent.

Divorce Rates for Different Groups

We know when people usually get married. We know who never marries. Finally, it’s time to look at the other side: divorce and remarriage.