Abstract: A method of social interaction has the steps of providing a network having a set of mobile devices associated with individuals; identifying a plurality of units of at least one subset of the set of mobile devices, at least one unit of the plurality of units comprising a group of mobile devices formed based on common social connections between individuals; characterizing the units by one or more characteristics; ranking a compatibility of units by comparing the one or more characteristics; causing at least one invitation or message to be transmitted over the network from a sending unit to a receiving unit; and sharing contact information of the units once an invitation has been accepted.