Brian Steinberg Senior TV Editor The Media Rating Council has granted accreditation to audience-measurement technology backed by iSpot, one of a handful of start-up companies that have been vying for months to compete more directly with Nielsen. The MRC, an independent industry organization that scrutinizes various measurement methodologies, has accredited iSpot technology that identifies, verifies and tracks national TV ad occurrences across 187 linear and broadcast networks. The system was first introduced in 2012.