The instant replay changed TV sports when it was introduced during the broadcast of the Army-Navy football game in 1963.
This year, Super Bowl 50 could go down as the tipping point for a new phenomenon: viewers playing back the ads on their smartphones right after they watch them on TV.
According to Google/YouTube, 330,000 hours of Super Bowl ads were played online during the broadcast of the game Sunday, up 10% from last year. Sixty percent of that online viewing occurred on mobile devices.
The percentage of mobile...