Beginning in mid-March for three solid weeks every year, fans (and regular folk) are glued to their screens — televisions, computers and mobile devices — in countless sports bars, homes and offices as the NCAA’s March Madness takes center stage. Last year, the tournament drew more than 60 million television viewers, averaged an audience of 10.7 million per game and racked up about 70 million live streams on broadband and mobile. In another measure of March Madness fever, marketing research company …