1. A computer-implemented method, comprising: accessing 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; inferring 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; selecting one or more computer-implemented objects of the plurality of computer-implemented objects, wherein the selecting is performed by a computer-implemented function executed on a processor-based device in accordance with the first expertise level and at least one of the plurality of the computer-implemented directionally distinct relationships; and delivering the one or more computer-implemented objects to the first person.