NEW YORK (AdAge.com) -- The online video space is no longer just a sideshow for marketers. Brands like T-mobile, Samsung and Cadbury have recently scored viral video hits racking up 10 million or more views. Meanwhile, the science of tracking online video audiences has made great strides in the past 18 months. In this ten-minute "About Digital" report Ad Age digital editor Abbey Klaassen explores some of the latest viral video trends and insights emerging from that data.