Abstract: A computer implemented method for incorporating media item data for use in a media item recommender system comprising: accessing a first database comprising a plurality of media item identifiers and associated metadata corresponding to each of a plurality of media items identified by the media item identifiers; generating first correlation data based on a comparison of the metadata corresponding to pairs of the media item identifiers to detect similarities between the media items identified; accessing a second database comprising a plurality of media item identifier sets for identifying sets of media items; generating second correlation data based on an analysis of the media item identifier sets to determine incidence of selected subsets of media item identifiers occurring together in a same media item identifier set; accessing a third database comprising a plurality of consumed media item identifier sets, wherein the consumed media item identifier sets associate one or more media item identifiers in a partic