Before revision:  We analyze population survey data showing that indeed the frequency of close-range contacts across individuals is characterized by a small fraction of people reporting very high frequencies of close-range contacts .
After revision:  We analyze population survey data showing that indeed the frequency of close-range contacts across individuals is characterized by a small fraction of people reporting very high frequencies . Strikingly, the average duration of contact is mostly invariant in the number of contacts, reinforcing the criticality of hubs .