An inside look at modern open source software developers--and their applications to, and influence on, our online social world.

"Nadia is one of today's most nuanced thinkers about the depth and potential of online communities, and this book could not have come at a better time." --Devon Zuegel, director of product, communities at GitHub

Open source software--in which developers publish code that anyone can use--has long served as a bellwether for other online behavior. In the late 1990s, it provided an optimistic model for public