Abstract: A computerized method identifies entities accessing locations in a communications network. A unique identification is associated with a private identification for each entity accessing the network. A known list is maintained for each entity. Each entry in the known list for a particular entity includes the unique identification and private identification of other entities known to the particular entity. A location list is maintained. Each entry in the location list includes a plurality of unique identifications of other entities having shared a common location in the network. A message is generated only if at least two unique identifications of a particular entry of the location list are identical to at least two unique identifications found in the known list of the particular entity. The message includes the associated private identifications of the at least two identical unique identifications.