Methods of detecting affinity interactions between at least two molecules of interest are provided. The method comprises: a. forming a plurality of interactors by coupling each molecule of interest with at least one nucleic acid moiety comprising an identification sequence element and at an association element; b. promoting an association between at least two nucleic acid moieties from different interactors to form a plurality of unique associated oligonucleotides, wherein each nucleic acid moiety may form more than one unique associated oligonucleotide, and wherein each unique associated oligonucleotide comprises at least two identification sequence elements derived from the at least two nucleic acid moieties; c. selecting the plurality of unique associated oligonucleotides; and d. subjecting the selected associated oligonucleotides to an analysis that permits detection of the at least two identification sequence elements. Similar methods directed to detecting functional interactions, libraries of interactors employable in the present methods, and kits comprising those libraries are also provided.