Nick Crossley is Professor of Sociology at the University of Manchester. Elisa Bellotti is lecturer in Sociology at the University of Manchester. Gemma Edwards is a lecturer in Sociology at the University of Manchester. Martin G. Everett is Professor of Social Network Analysis at the University of Manchester. Johan Koskinen is a lecturer in Social Statistics at the University of Manchester. Mark Tranmer is Senior Lecturer in Social Statistics in the School of Social Sciences at the University of Manchester.