16. The system of claim 8 comprising the one or more processor-based devices configured to: generate an explanation for the delivery of the one or more computer-implemented objects to the first person, wherein the explanation comprises a reference to one of the plurality of computer-implemented directionally distinct relationships.
8. A computer-implemented system comprising one or more processor-based devices configured to: access a plurality of computer-implemented directionally distinct relationships among a plurality of computer-implemented objects, wherein the plurality of computer-implemented objects do not represent users of a computer-implemented system; infer automatically a first expertise level of a first person who is a first user of a computer-implemented system from one or more usage behaviors; select one or more computer-implemented objects of the plurality of computer-implemented objects, wherein the selecting is performed in accordance with the first expertise level and at least one of the plurality of the computer-implemented directionally distinct relationships; and deliver the one or more computer-implemented objects to the first person.