Book excerpt: While many periods of history are popularly known by their 'great men',the Enlightenment stands out for the prominence of its 'great groups'. This volume assemblesleading scholars using data-driven scholarship to study the networks that madethe Enlightenment possible, and contributed to creating a new sense of Europeanidentity. From Voltaire's correspondence with Catherine the Great, to AdamSmith's travels on the European continent, mediated and unmediatedcommunication networks were the lifeline of the Enlightenment. What is particularly notable about theEnlightenment is how these different networks were central to theirparticipants' identity. One could nottake part in the Enlightenment on one's own. Although some older historical studies highlightthe importance of social networks in the Enlightenment, data-driven approachesallow for a more comprehensive and granular understanding of the many differenttypes of networks that formed the intellectual and cultural infrastructure ofthe Enlightenment throughout Europe. The recent influx of metadata from thecorrespondences of major Enlightenment figures now allows scholars to studythese networks at both the micro and macro levels, and to explore the worlds ofthe philosophes and the "nodes" intheir networks in rich detail. It is at this intersection of Enlightenmenthistoriography, data capture, and social network analysis that the essayscollected in this volume all fall, taking advantage of new data sources,configurations, and modes of analysis to deepen our understanding of howEnlightenment sociability worked, who it included, and what it meant forparticipants.