2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19478The topology of an instant messaging system is described. Statistical measures of the network are given and compared with the statistics of a comparable random graph. The scale-free character of the network is examined and implications are given for the structure of social networks and instant messenger security.5 pages, 4 figuresStatistical Mechanicstext