12. The system of claim 10 , wherein the system is further configured to: query the DCC system to find a match between the at least one concept structure and the at least one MMDE; and correlate a second set of metadata returned respective of the least one MMDE with at least one of the determined user attention and the first set of metadata.
10. A system for determining a user attention to at least one multimedia data element (MMDE) displayed in a web-page over a user computing device, comprising: an interface to a network for receiving a request to determine the user attention, wherein the request includes at least the web-page and an identification of the at least one MMDE in the web-page for receiving at least one sensory signal captured by at least one sensor connected to the user computing device; a processor; and a memory connected to the processor, the memory contains instructions that when executed by the processor, the system is configured to: query a deep-content-classification (DCC) system to find a match between at least one concept structure and the received sensory signal, wherein the at least one concept structure includes a plurality of metadata associated with reduced clusters of the MMDEs, the clusters represented by a compressed number of signatures; receive a first set of metadata related to the at least one matched concept structure; analyze the returned set of metadata to determine the user attention with respect to the at least one MMDE; and associate the at least one MMDE with the determined user attention.