In one aspect, a method for generating groupings of users at a social networking service is provided, the method includes determining identifying information for a user, identifying one or more other users having a set of identifying information in common with the user, generating a group including the user and the one or more other users, associating the set of identifying information common between the user and the one or more other users with the group and providing recommendations to the user for activity with respect to the one or more other users based on the set of identifying information.