How many people do you know?: Efficiently estimating personal network size

Tyler McCormick, Matt Salganik, and Tian Zheng just wrote this article on using the scale-up method to estimate the size of people's social networks using responses to questions such as "How many people do you know named Kevin?" They build upon earlier work by Bernard, Killworth, McCarty et al. and Zheng, Salganik, and Gelman. This new paper is great; it takes these methods from the "cool" stage to the "useful" stage.