In the second year the Super Bowl has been streamed online, viewership has grown sharply — even if it's still barely a blip compared to traditional TV viewership. According to CBS, its stream of Super Bowl XLVII garnered 3 million unique viewers, compared to the 2.1 million that NBC reported last year. Unsurprisingly, CBS says this is the largest audience the CBS Sports site has ever seen, and it's a significant number for any single streamed event.