11. The system of claim 7 , further comprising: a recommendation explanation function that delivers an explanation for the recommendation to the first person, wherein the explanation comprises a reference to a common interest.
7. A computer-implemented people matching system, comprising one or more processor-based devices configured to execute: an inference function that infers from a plurality of usage behaviors a mutual interest between a first person who is a first user of the computer-implemented system and a second person who is a second user of the computer-implemented system; a recommendation-generating function that generates a recommendation comprising a representation of the second person for delivery to the first person, wherein the recommendation is generated based on the inference of mutual interest; a first expression of interest function that delivers a first expression of interest that is in response to the recommendation from the first person to the second person, wherein the first expression of interest comprises the first person establishing a first directionally distinct computer-implemented relationship between the first person and the second person, wherein the first directionally distinct computer-implemented relationship comprises a subscribing relationship that delivers content authored by the second person to the first person; and a second expression of interest function that delivers a second expression of interest that is in response to the first expression of interest, wherein the second expression of interest comprises the second person establishing a second directionally distinct computer-implemented relationship between the first person and the second person.