This disclosure relates to systems and methods for identifying members that increase engagement at an online social network. In one example, a method includes retrieving network connectivity and member interaction data for members of an online social networking service that includes a plurality of explicit social networks, building statistical correlations between properties of the respective explicit social networks and interactions between members of the respective explicit social networks, and ranking a set of potential new members for one of the explicit social networks according to the statistical correlations and a statistical likelihood that the new members will increase member interactions with the explicit social network.