Should I post a tough parenting question on Twitter, ask my Facebook community, or email a few friends who are most likely to have useful suggestions? What would be the best place to reach people to share an intriguing job announcement? These days, we have a multitude of network options, and we assume that computers will facilitate our networked communities. Until I read Joy Lisi Rankin’s new book, A People’s History of Computing in the United States (Harvard University Press