Abstract: An online dating and relationship system relies on common interests in, and arranging for, specific face-to-face in-person activities. Potential activities are ranked by an activity ranking engine drawing on activity-related attributes of the users and of the activities. Mutual selection of an in-person activity enables the users to vet potential matches and to proceed to engage in the activity together. The ranking and match engines may take into account intrinsic user and activity attributes as well as activity-related attributes derived from the behavior of the users in relation to the activities.