1. A computer-implemented method comprising: identifying an activity performed by an interacting user of a social networking system; determining an influencer score for a viewing user connected to the interacting user, wherein determining the influencer score for the viewing user comprises: determining an influencer score for each connection in a set of connections of the viewing user; determining an influence value for the viewing user with respect to each of the connections, the influence value with respect to each connection being indicative of the viewing user's influence on the connection; and determining the influencer score for the viewing user based on the influencer scores for the connections weighted by the influence values for the viewing user with respect to the connections; determining, based on the influencer score for the viewing user, to send a story describing the activity to the viewing user; and sending the story describing the activity to the viewing user.