1. A computer-implemented method, comprising: inferring automatically from a plurality of usage behaviors that are associated with a plurality of users' use of a computer-implemented system a mutual interest in establishing contact between a first person who is a first user of the plurality of users and a second person who is a second user of the plurality of users, wherein the plurality of usage behaviors do not comprise an explicit expression of interest between the first person and the second person; generating automatically a first recommendation comprising a representation of the second person for delivery to the first person, wherein the recommendation is generated based on the inference of the mutual interest; generating automatically a second recommendation comprising a representation of the first person for delivery to the second person, wherein the recommendation is generated based on the inference of the mutual interest; determining a first expression of interest that is based on one or more behaviors exhibited by the first person in response to receiving the first recommendation; determining a second expression of interest that is based on one or more behaviors exhibited by the second person in response to receiving the second recommendation; determining automatically a bilateral expression of interest between the first person and the second person based on an assessment of the first expression of interest and the second expression of interest; and revealing automatically to the first person and the second person the bilateral expression of interest if the bilateral expression of interest is sufficient.