16. The system of claim 8 , wherein said subjective user state data solicitation module configured to solicit the data indicating occurrence of at least one subjective user state associated with a user from the user comprises: a requesting module configured to request for an indication of a time or temporal element associated with occurrence of the at least one subjective user state.
17. The system of claim 16 , wherein said requesting module configured to request for an indication of a time or temporal element associated with occurrence of the at least one subjective user state comprises: a requesting module configured to request for an indication of a point in time associated with the occurrence of the at least one subjective user state.