From the webpage:
There are millions of projects on GitHub. Every day, people from around the world are working to make these projects better. Opening issues, pushing code, submitting Pull Requests, discussing project details — GitHub activity is a papertrail of progress. Have you ever wondered what all that data looks like? There are millions of stories to tell; you just have to look.
Last year we held our first data challenge. We saw incredible visualizations, interesting timelines and compelling analysis.
What stories will be told this year? It’s up to you!
Send a link to a GitHub repository or gist with your graph(s) along with a description to email@example.com before midnight, May 8th, 2013 PST.
Approaching 100M rows, how would you visualize the data and what questions would you explore?