In the last ten or fifteen years, social production has proliferated all around us. Maybe the most widely known form of social production is open-source software. The Mozilla family of Web applications, including the Firefox browser, are open-source programs -- free for anyone to use, and maintained by volunteers who are continually updating and improving them. Apache software, another open-source application, is used by about 70% of corporate Web servers, including those for many high-traffic commercial sites. Google, CNN, Amazon, and other large commercial online presences power their Web sites with the GNU/Linux operating system, which is also open-source and free. Hadoop, one of the most widely used analytics programs for processing unstructured data ("Big Data"), is an open-source application.