16. A system, comprising: a processor; and a memory storing one or more application programs configured to perform an operation for inferring user interests based on metadata of a plurality of multimedia objects captured by a plurality of users, the operation comprising: receiving, for each of the users, metadata describing each multimedia object in the plurality of objects associated with that user, wherein each multimedia object includes one or more attributes imputed to that object based on the metadata; identifying one or more concepts from the one or more attributes, wherein each concept includes at least a first attribute that co-occurs with a second attribute imputed to a first multimedia object; and associating a first one of the plurality of users with at least one of the concepts based on the attributes imputed to multimedia objects associated with the first one of the plurality of users by determining a correlation measure between the first one of the plurality of users to each of the concepts based on the attributes imputed to multimedia objects in the plurality of multimedia objects associated with the first one of the plurality of users.
16. A system, comprising: a processor; and a memory storing one or more application programs configured to perform an operation for inferring user interests based on metadata of a plurality of multimedia objects captured by a plurality of users, the operation comprising: receiving, for each of the users, metadata describing each multimedia object in the plurality of objects associated with that user, wherein each multimedia object includes one or more attributes imputed to that object based on the metadata; identifying one or more concepts from the one or more attributes, wherein each concept includes at least a first attribute that co-occurs with a second attribute imputed to a first multimedia object; and associating a first one of the plurality of users with at least one of the concepts based on the attributes imputed to multimedia objects associated with the first one of the plurality of users by determining a correlation measure between the first one of the plurality of users to each of the concepts based on the attributes imputed to multimedia objects in the plurality of multimedia objects associated with the first one of the plurality of users. 21. The system of claim 16 , wherein the concepts are identified based on Latent Dirichlet Allocation (LDA).