With more than 9 million users and 21 million repositories, Github is the world's biggest code sharing platform. Its API offers a window to the public activity of about 600,000 events a day. In this talk, Christophe will present how he transformed this activity into a graph and mapped the network flow between users, communities, programming languages, and code repositories. He will demonstrate how to gain new insights by building interest graphs and recommendation engines on top of this valuable data