1. A method comprising facilitating a processing of and/or processing (1) data and/or (2) information and/or (3) at least one signal, the (1) data and/or (2) information and/or (3) at least one signal based, at least in part, on the following: an ontology for specifying a hierarchy of one or more abstraction levels for items data used in latent factorization models; a generation of one or more user models for the one or more abstraction levels; and a selection of at least one of the one or more user models for generating one or more recommendations for one or more applications, one or more services, or a combination thereof based, at least in part, on one or more privacy policies, one or more security policies, or a combination thereof.